Great guide! I can't think of anything to add. Read it over several times to take in all for the tips, they are helpful. I replaced my dead HD with a 120GB SSD (OCZ Vertex 3 VTX3-25SAT3-120G). It is working great with Snow Leopard. I had to use Trim Enabler but that seems to be working fine. The 2.5 to 3.5 drive adapter was too small to fit the apple attachment be the two sided tape mount seems very secure.