OK, time for a quick fruit tree pruning primer.
Here goes.....
Take a good look at your tree. Start by taking out any diseased, damaged or crossing branches and any branches growing back toward the center from the surrounding branches. Also cut any growth that is growing out of a branch that is growing downward at a steep angle.
Next cut out branches that directly shade out other branches. If you allow space between branches that overlap/shade other branches the remaining branches will receive more air flow and greater light penetration which will lead to a tree that is more vigorous with more fruit production of higher quality.
(Keep in mind. In a dry hot desert climate braches can be closer together which is why most people here grow in a bush form. In a climate with more rain or humidity there needs to be more room for air flow and more space between branches that shade each other. So yes climate does play a role in how you prune your trees.)
Prune to an outward facing bud on the underside of the branch or stem. If it’s a large branch and you don’t see any buds don’t worry about it. In that case there will likely be may new branches start all around the cut. You will eventually chose one to keep and cut all the rest.
If the your tree is too tall or not shaped in a way that’s conducive for easy care and harvest. Determine what major cuts can be made before you start. The reason for this is simple. If you are going to cut off a large limb or main scaffold branch. There is no need to take a lot of time pruning it.
Don’t worry about cutting off to much or that you are hurting your tree. After its been pruned it will produce many new branches. From them you can fix almost any problem you and re-shape it into a beautiful tree with fresh new vigorous and productive branches later.
You may want to cut your tree short. Say to four feet off the ground. Then you would easily be able to train it into a low and spreading tree where all of the fruit would be within easy reach. Or you may want to just follow the basic rules set out above. If you are still comfortable climbing you can just follow the basic rules set above. Then as you get more comfortable with pruning you could always still shorten it later.
There is some reading I would recommend and a video or two. You will also need proper tools.
Sunset Basic Pruning Cuts.
http://www.sunset.com/garden/garden-basics/basic-pruning-cuts-00400000014985
AZ Master Gardener; Pruning Fruit Trees.
http://ag.arizona.edu/pubs/garden/mg/pruning/fruit.html
This is a university level instruction video produced to teach people in the UC Davis Master Gardener Program. Instruction on Pruning starts at the 36:00 min mark. You may feel that a lot of it does not relate to you. Even so it will show you just how easy it is to shape your trees. I have watched both videos in the series more than once start to finish. The Home Orchard Part 1
By the way. If you watch the second video in the series they cover more pruning. Keep in mind. I summer prune all of my fruit trees after they have fruited with only one exception. The exception is figs because figs never stop producing until frost. They do not mention that so I thought I should.
There are a lot of mistakes in this video like pruning to an outward limb on the top side of a scaffold instead of the bottom side. Those are going to grow strait up and are only going to feed the birds. (I think they read some basic instruction without ever seeing any pictures and went from there) I also think they took off a lot of fruiting wood that they did not need to. They cut all the side branching all the way back to the main scaffold branches which did not need to be done. Even so the end result will be healthy trees producing more fruit. So as bad a job as they did the result is still better than what they had and they can always fix whatever they did the next time they prune. (If those trees where mine I would have cut all of the main scaffold branches to about 4-6’ from their point of attachment to the main trunk or at whatever length they get to high off the ground to be easily picked and pruned. I also would have cut back on the side branches and opened them with some thinning cuts and would have been done.)
One last word. Even if you totally screw up your pruning the tree will still be more vigorous and produce much more fruit next year. Not only that but whatever you do will be fixable when you prune again the following year. No you will not need to do a massive cut back each year. But you will be continually shaping your tree to suit your needs. The best part is that it will reward you for it.
A few tools.
Bypass Loppers
http://www.amazon.com/Fiskars-9146-Bypass-Lopper/dp/B000BX1IB6/ref=sr_1_3?ie=UTF8&qid=1370975117&sr=8-3&keywords=loppers
Bypass Pruning Shears
http://www.amazon.com/Fiskars-9124-Professional-Bypass-Pruning/dp/B000F97DWO/ref=sr_1_1?s=lawn-garden&ie=UTF8&qid=1370978861&sr=1-1&keywords=pruning+shears
Pruning saw. With your tree you may need a larger (14" model) one or even a chain saw.
http://www.amazon.com/Corona-RS-7265-Folding-Pruning/dp/B001RD7LRO/ref=pd_sim_lg_15
Lastly and perhaps most importantly. You should have a good book on pruning. I have several books on pruning. This one has lots of illustrations to keep you out of trouble and I highly recommend it. GET A USED ONE. There are some listed from reputable Amazon sellers in the $ 8.00 price range. http://www.amazon.com/Trees-Urban-Suburban-Landscapes-Illustrated/dp/0827380402/ref=sr_1_3?ie=UTF8&qid=1370980646&sr=8-3&keywords=an+illustrated+guide+to+pruning
If you have any more questions just ask. I will do what I can to help.