One thing you really need to remember. If you do assemble the do it yourself box cabinets make sure the wall is plumb, the inside corner is square, and the floor is 90 degrees to the wall.This makes it easier to decide where to shim the cabinets or make adjustments to these areas.Then make sure the cabinets are square after assembly before you put them against the wall.
Buy plenty of shims and dont forget the correct screws for attaching the upper cabinets.Sheetrock screws DO NOT qualify because they dont have what is called shear strength.They can snap off with to much weight.
"Real men dont read or need directions."
(Thats because we like to get lost!)
OK folks ,anything I missed?