Without buying any expensive equipment, you can give this a try. Use a sharp negative and enlarge to as big as you will print. Focus carefully in the center and make sure it is as sharp as possible. Make a work print with the lens -wide open- then see what you have. If all is well, the lens is of decent quality and things are working, it should be a good print out to the edges. By stopping down, you will not find out. This will give you the least depth of field and the most distortion if things are out of alignment.

I use a machinist's level (Starret) to check the base board to film plane relationship. A bit of study will show you which adjustment does what. If you aren't sure, write down any changes you make so things can be returned to "normal" if you guess wrong. tim