Replace the mirror box in my d5100

Hello, I see you have a teardown guide for the d5100. My question is do I need to tear the whole thing down or just use your guide on removing the front of the camera to get to the mirror box for replacement? I have been searching and searching for mirror box replacement instructions, and haven't found one. I found a mirror box, but just want to make sure it is not too involved before purchasing it. It also looks like there may be a couple wires to solder in the replacement of the mirror box but not sure.

Can you guys create a guide on replacing the mirror box? Thanks for your help in advance.