Replaced my iPhone 4's home button and battery !!! Hurray !!!
5 - 30 minutos
The home button of my iphone 4 was unresponsive.
The battery had become inefficient with time.
The repair went perfectly well. iFixit's guide was easy enough to follow.
Just make sure that you have the the necessary tools iFixit recommends for e.g. the iPod opening tool etc. They are a boon. In addition quite a deal of mental concentration and steady hands is necessary. Also make sure to keep track of the screws, they are very easy to lose. I almost lost one.. phew !!!
iPhone 4 Replacement Battery
iPhone 4 Home Button Assembly