How to replace my Rear panel?

if you are careful and considerate then it shouldn't be a problem. If something doesn't fit, don't force it, make sure you can see what it is you are pushing/pulling/installing. Look at the way your motherboard is shaped and where camera/sim tray/headphone jack/dock are.. this will guide you in putting the motherboard in safely. The motherboard needs to be inserted sim tray end first and sits under a little lip near the power button, if it isn't in right there then your sim tray won't go in, and your LCD won't close..just a hint. ***Make sure before you do anything that you work on the phone when it is turned off (or run out of charge)