The guide is very good and I succeeded in opening the iphone and fixing back again all the parts. Unfortunately, the wi-fi module still doesn't work, I don't know why. Anyway, many thanks to all ifixit staff, since they are helpful, efficient and kind. Alberto from Italy
I had a bit of hard time, but eventually I succeded. One thing: the screwdriver in the kit is quite rubbish! Luckily I had another one. Be careful when re-assembling original drive: I did it twice, because I did not undestand how to secure it the first time. Remember to note the two holes hidden inside the aluminium body...