Tools required: Torx 6 screwdriver, Phillips screwdriver, plastic tool such as a credit card or guitar plectrum.
Remove your back cover, battery, sim and memory card. Lift the camera surround away from the phone. It should come away with a little force.
Your phone should now look like below. Remove the three screws you have access to.
Run your plastic tool around the join of the silver bezel at the back of the phone to unclip it.
Your phone should now look like below. The main body of the phone should be loose and can be lifted away from the rest of the phone's housing.
Your phone should now look like below.
Turn your phone over. The circled connector needs to be detached. It attaches like a plug and socket. Simply lift up to unplug. A number of clips hold the screen and keypad to the circuit board. Some of these clips are indicated by the arrows. Pull these clips back to separate the circuit board from the LCD and keypad.
Your phone should now look like below. Note that the LCD screen is still attached to the circuit board by another ribbon and connector, circled. Detach this like the previous one.
Your phone should now look like below. Four clips hold the keypad part to the black frame. Unclip these to remove this part.
You should now be able to lever the LCD screen out with your plastic tool.
You should now have the screen removed. Reverse the whole procedure for reassembly.