Small server with dual drives and one crashed. Small SSD's were so cheap that I put in two of those added memory and it's like a new computer.
Was afraid at first in getting the cover off but figured it out.
Used your guide but it didn't really tell me that the wire sockets for the daughter boards may come off. Thought I had broke it and was ready to get out the soldering gun - then realized it was a socket that popped back on. All worked - job done - felt very good about it.