The instructions were excellent and the job of removing & replacing the hard-drive went like clockwork. A novice could handle this task easily with modest mechanical skills. Someone previously suggested putting aside several hours to do this..... I disagree as I replaced the HD & both RAM chips in approx. 10 minutes & I was pacing myself. As far as hardware is concerned, I found a total of 7 screws to deal with! You don't have to be too anal to keep track of 7 screws especially when 3 of them are captive in the memory cover. Unless you are mechanically inept, go ahead and do this simple job!