Do your own work on your own weapons. Deal with it. Who do you trust? I trust myself. Mechanical skills are an aquirred habit
I can strip a 1911 to pins and reassemble it with no problems. However I promised one of my fiends who’s a gunsmith that I’d never take the sideplate off a S&W revolver, ever again.
Simple maintenance, including things like “drop in” parts aren’t a problem. But actual tuning, like timing a revolver, headspacing a rifle, honing the contact points on a trigger/sear, I leave to professionals. I know my limitations (including reassembling a S&W revolver.(
Mark