I have rheumatoid arthritus, I get about half a plant done trimming then my hands are finished. I flower 12 big plants and 3 to 4 medium ones every cycle. I use a 19" spin pro knock off hand crank trimmer. I also am a BIG fan of using the wire blades vs the big knife like blade to trim. Only prob is the wire blades break off often, and I've yet to find replacement wire replacement ones that fit. Spin pro have a round center part, mine are "D" shaped. A little jb weld fixes it. But would love to have spare blades for backups. My flowers always come out great. Never have any complaints in about 4 yrs.
If anyone has a source for 19" wire blades with a "D" center, PLEASE pm me. I've searched for years and no luck. And the shitty ass grow store u bought it from is utterly useless. Great at point of sale, after the sale they could care less.