*** YOU NEED YOUR OWN TRI-BLADE SCREWDRIVER KIT *** This case change was one of my first but I would rate it as intermediate. You have to remove the ribbon cables and be very careful with very small components inside. Good tweezers are recommended. The components arrived in perfect condition and I didn't even have to shave off the excess plastic to get them to fit! There is a firmness in the hands. The only thing I would like them to change is the ABXY keys. The standard switches are double-injected, meaning the letters' gray "seal" is actually a thick piece of plastic running the length of the button (so they don't wear out). In this replacement, however, they are simply pressed over the keys. Overall, I am very happy that I chose this item.