 You should. And sometimes a lot of the pros will put the base cabinets in first, but because they dictate the layout and you're trying to match your lines. But if you use a level, you can do that. I've never done it that way. I almost always put up the upper cabinets too because I don't want to work that hard. I'm with you. Well, but a couple other little things. Take the shelves. Take all the shelves out of the upper cabinets. Take the doors off.