Another lefty that uses my trigger finger. I tried switching to the right side, and went back to using my trigger finger. It works much better for me. I shoot a 16 -40 limited.
I picked up mine used from a friend who was getting out of shooting, all ready set up. Big difference moving from a turret press. Only no case feeder, that's next. Good luck with yours.
Not an expert, but I have read a lot here on this subject. As Hi Power Jack said a lighter bullet and slower powder is the safer way to get to 9mm major.