One of the hardest parts of the entire build was sleeving. I did a lot of rewiring, including shortening cables and building my own SATA cable. It was a definite learning experience and something that you get better at the more you do it. These days they sell some nicely pre-built cables like these, or you can get a professional to do them if you have lots of money. Great experience, but not sure one I'd want to do again.