It's essential to assume that your floor has a high point and locate it. Shimming a cabinet to achieve level and plumb is much simpler than cutting the bottom to ensure a square and flush fit.
Add markings for any appliances and fixtures you’ll install. If you’re planning to add appliances such as refrigerators or any fixtures, measure them first.
Start with the upper cabinets. Begin by attaching a ledger board to the wall at the desired height for the cabinets. This temporary support will hold the cabinets in place during installation.