The trigger.
I tried to go to my pistol range once a week just to force myself to get use to it, but all I ended up getting was a blister on my trigger finger. After about 4 sessions of shooting my finger didn't want to pull the trigger. Sound weird?
I had too much trouble keeping all shots on paper without a wild shot here and there.........and I didn't feel like doing any gunsmithing.
I picked up an S&W Model 19-357mag to solve my cravings for a revolver. One thing I've really learned is, I don't like snubbies.