When I first got my SW9VE, i shot low and left.
Right after I got it, I used it to qualify for my CCW.
The instructor had us warming up, doing a little bullseye shooting, just kind of messing around before the actual qualifying.
I was shooting low and left, and I told the instructor my sights were off.
He walked up to the target, cut a slit in it and put a playing card in the slit.
Then he said "Let me see your gun"
I handed it to him, he racked one in, looked down the sights, pulled the trigger and split the card.
He unloaded the gun, handed it to me and said "there's nothing wrong with those sights."
After that, I shot better
I kept the playing card, it's in my gun cabinet and it reminds me every day that my Sigma shoots straighter than I do.
Oh, and the trigger does get better.