As I mentioned above, you have the option of using a piece of 1' x 3' lumber for the installation or building a frame to support the cabinets (I have included a picture of a sample frame below). This can be made out of 2' x 4's and should be tall enough to support the bottom of your wall cabinets. If you plan on installing more than one kitchen, then I would suggest the frame, but a piece of lumber will do just fine if this is a one time event. In either case, you will need another set of hands to help with the installation.
Pink Walls and White Cabinets:
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