just an old Service Tech worked on computer from DOS Days
1 - 2 horas
all I did was add a back up HDD to my New Mac Mini 2012 just Bought it and need a place to back up too
Smooth, had no Trouble at all
Get A Good set of Tools, if you can afford the mac approved tool set for $80.00 get it, and follow the steps in the ifixit Guide and you shouldn't, have now problems, I'm 53 years old, so any tech or person can do this.....