Is it hard to replace the battery in the 3Gs

Iwatched 3 instructional videos. The only question I have is about how the ribbons re-attache to the cable connector. Do they just snap in or are there locking hasps that hold the ribbon in place?

no1, 2, 4, 5, 6 & & are all push fit connectors. No.3 is a slide in (from the upper side toward bottom) then push lock bar down. It only goes in until you feel resistance, not all the way to the white line. no.6 and 7 are little round antenna connectors, they can be tricky..just get your eye as close as you can to see that the parts are lined up or use a handsfree lens. Don't force things, but sometimes if you are the first person to open the phone the connections can be a bit stiff/unbendy..just take your time.

Thank you everyone