If you want to do it, i can give you some advice before you start ! i'm 19-college student and i did it on my w126 over the weekend! i had to do it twice since ermm the transmission didnt work the first time so i had to send it in so they can repair it again!

But keep in mind to PLAN EVERYTHING. It was soooooo much easier the 2 nd time becuase i planned everything! infact it took me 1 hour and half to put it back up because i had planned everything ! it was soooo easy compare to the first time that took me 6 hours!