Welcome to the Forum Donna:
Some of the stainless steel finishes are really just a clever paint job and will show finger prints, smears and stains. Be sure you are getting real stainless steel and, remember, stainless is not scratchless. The metals added to the steel to make it stainless will also make it soft and easy to scratch with another piece of metal. Otherwise it is a lifetime finish and will always look nice.
I don't understand the reasoning for replacing the appliances before the cabinets but it is OK; just make sure you move them completely out of the room before any work begins (prevent scratches).