Good video, Harvey.
A couple notes.
A regular wedge or cleft graft is with two pieces of the same diameter, add the wedge is cut down the center of the rootstock. Harvey has shown and offset wedge of cleft, which is used when the rootstock and scion are of different sizes. The wedge is cut off center at a point where the width of the cut is the same as the width of the scion (smaller).
You can also use the green nursery tape to bind the two pieces together, rather than the rubber bands.
Wrapping the scion before inserting, as Harvey did, makes that part of the task much easier.
You can also take some white paper and make a shade to slide over the graft. This keeps the scion cooler (doesn't get cooked or dried out as easily), until it calluses together.
The scion will grow through the Parafilm, so don't worry about covering up the buds.
Take some cuttings of apple, or pear, or something that is handy and practice using the knife, and making the cuts.
Finally, make sure you know where the knife will go, and what it will cut off of your body, before you make a cut. Sooner or later it is going to slip. If it will cut wood, it will cut you really easily. In other words, make sure you body parts are NOT in the direction of the cut.