hey guys! the bigger the clone you take the more it will bush out, i would go a fair way down, where you see your secondary canopy section now from the top down, you could easily take a 4-5inch clone, and if you snip where there are many nodes close together, you can slice of the bottom leaves and shoots (just a couple) and wherever you make those cuts, down near the 45 degree angles slice they will shoot out roots. if you are going to top, don't be shy, dont take an inch or 2, it won't bush out as i explained, take a good section out, and the rest will transform overnight....
hope that helps
clones are much tougher than you think. ive snipped with dirty scissors and had success! their goal is to survive and make new stemcells, if you use rooting gel this will help seal out any bad bacteria...
But Use a Clean Knife if you want to be sure, be careful, and once cut, dip and plant straight away! and where u have make the cut on the plant, it will simply heal in a few hours, it's not damaging the plant, just re-routing it