A couple quick install questions

I'm just finishing installing my 18x33 atlantic vantage pool, and have a couple final questions.. Hopefully someone has some help.

A couple of the uprights aren't level (meaning the wall isn't level either).. they lean out slightly, from bottom to top (meaning the top of the pool is slightly wider than the bottom).. should I push these to level and lock them in with the top rail, or will the water naturally fix this?


Much less pressing.. the instructions say not to cut the excess liner, but is there any reason I can't?