I use a free flip phone from my work. My daughter received an iPhone 5 from Mom and me for Christmas. She had used her iPhone 4, for for the entire 2 year contract.
It needed a home button, earpiece speaker, vibrator and back cover. I was successfull in the repairs, but damaged the digitizer cable in the process. I am a man and, not afraid to say, I only looked at the picture during the tear down.
Read all of the instructions and cautions very carefully. If I had, I would not have damaged the digitizer and would have saved some money.