One comes with the piece of glass here.
This is the one I used.
Yes, you can heat it up and remove it... The problem would be getting it to stay once you get it cleaned out and try to stick it back.
The "second" piece of glass is the camera itself.
Sorry I didn't see this earlier.
My camera was a little blurry, but I found out that was due to being dirty and some condensation.
Before I replaced the back camera lens I cut a small corner off of my lens cleaner cloth for my glasses. I used a pair of tweezers and the same cleaning solution to clean the camera lens. If you think the camera needs repaired, you could replace that at the same time. It would go beyond the scope of my guide but I did see the part was available for purchase.
As far as I know it will. The glass itself was very inexpensive and if you order it, you will be able to verify the size before you attempt the replacement. As most you'll be out a few bucks.