Hacking Changing the shell on my DS "Phat". How difficult?

[DaBurgh]

I just ordered a gun metal gray shell, just the shell no new buttons, battery cover etc and the tri-wing screw driver and was wondering how difficult it is to switch out the case? I'm picking it up because the DS I got from my gf's little bro has a broken right hinge which is why he got a DS lite I'm assuming. His loss is now my gain and I read that simply switching out the case will fix the hinge. I ordered from "Power gaming parts.com"

I've taken apart my PS2 in the past to clean the laser because of a disc read error so this can't be much harder. I just wanted to know if there was anything to watch for when doing it. I don't want to mess up anything internal. Thanks in advance.