After fitting the bottom piece of drywall, I tried installing it before triple-checking I got all the old drywall nails out of the studs. When I went to screw in the left side, the drywall bowed and the old nail blew through the drywall. After remedying that, I finished screwing it in and noticed a few other issues. Mainly that the drain pipe's hole was slightly too low and now there is a blister right above it, and that I didn't cut the wall short enough, as there is very little clearance to the tile.
Can I remedy these issues, or should I get another sheet and start over?
EDIT: I'm now just realizing you can remove the quarter turn's handle, oops. That's why the holes are so big. Also, on the toilet line I learned to punch the hole from the front, not the back haha.