I did one once. It was incredibly difficult because the footprint of the original was quite small. The replacement had a bigger footprint under the counter, and would not fit. I had to get about two square inches of 3/4 plywood out of the way. Using my cordless drill and mirrors I was able to drill a series of pilot holes into the excess wood and chip it out. I was dealing in very tight confines inside a truck camper, and having a bigger space to work in would make the job easy.
Use your digital camera on close up to take pictures from all kinds of angles before you remove the old one so you can be sure the new one will fit.
