No matter which shears you have, dull shears will not work as well as sharpened ones. The new property we bought has 30+ years of overgrown trees, shrubs and vines which JD is systematically ripping out and trying to tame. He has used many brands of pruning shears, loppers, and hedge clippers, and watched some guys he hired to help use an electric grinder to sharpen their chain saws.
So my big job was to search the internet to find out how to do this, and I was amazed at what I found! Try googling "How to sharpen garden tools with a grinder" and you get all kinds of advice on using grinding stones, files and electric grinders. You tube has tons of videos.
JD has wanted his electric hedge pruners sharpened for years, but can't find any place that will do that. Who knew it's easy to do yourself!! Axes and shovels also work better when sharpened!
Suzi
Also, just so you know, we aren't destroying everything. We are even rescuing some things like a beautiful flowering dying Wisteria in a container, and a dying blood orange. Under the overgrown mess, JD found a really good hand trowel that I can use, and and odd low metal container that I can use for mixing potting soils. Our main purpose of ripping out useless plants is to replace with grape vines, figs, olive trees, citrus, berries, macadamias, avocados, and beautiful landscaping flowers and plants as well.
He came eye to eye with a rat, who stared at him, then ran!