I dropped my phone twice and needed to replace both the display assembly and rear glass panel.
Shaky at first. This is a take your time kinda project.
1) Go slow - I almost stripped a screw, yikes!
2) Use alot of light!
3) Sort and label where each screw goes - this made the process fast.
Pro Tech Toolkit
iPhone 4 (CDMA/Verizon) Screen
iPhone 4 (CDMA/Verizon) Blank Rear Glass Panel