20 - 30 minutos
My daughters 3GS Iphone was in need of battery replacement. Went online to search for solutions. Found your easy to use guides
The guides were great. And replacement successful. Took about 30 minutes total.
The screws are very small...if you have big fingers...be patient. I would recommend having a tweezers to put the screw back in its hole prior to screwing them in...man fingers can have an issue getting these tiny screws back in place. The photos were very helpful...higher res may help a bit if that can be done.