This is a high skill level repair. It will require a steady and gentle set of hands, a good repair kit, and a lot of patience. With that being said, it is doable with these prerequisites.

Also, USE THE RIGHT SCREWDRIVER!!! One of my 3ds' screw got fricked up bc i use the wrong size of screwdriver. (The shape of it from + became to ●)

i made the screwdriver mistake i think