Tools required: Torx 5 screwdriver, plastic tool such as a guitar plectrum or credit card.
Remove your back cover, battery, sim, stylus and memory card. Remove the four screws you can see then pull the coloured outer band at various points in the direction shown by the arrows below. This will release the clips holding the band in place.
Your phone should now look like below. The key lock sliding button will also come away with the coloured band.
Release the front cover in the same way you released the coloured band, pulling at various points around its outer edge. Start near the bottom as there is a ribbon cable at the top of the phone which can be damaged if too much force is applied to it.
Lift the cover up and back so that it looks like the photo below. Note that it is still attached by a ribbon cable at the top of the phone so don't try and separate it from the rest of the phone just yet.
Lever the keypad off. Just slide your plastic tool underneath the keypad to release it.
Now slide your plastic tool under the LCD screen. It should come away with little force. Then lift the LCD up and over so it sits on top of the front cover. Again, it is still attached by ribbons so it can't be removed completely yet.
With the LCD slipped over, your phone should now look like below. Remove the two screws you can see and the battery compartment will come loose.
Below you see the battery compartment removed. I have also flipped the front cover and LCD back over to cause less stress on the ribbons whilst performing the next action (and taking the photo). A ribbon connector is circled below. It attaches like a plug and socket. Just lever it away from the circuit board to disconnect it.
Note that the connector, circled at the bottom of the picture is the one you disconnected in the stage above. Now lift the circuit board up to access some more ribbon connectors. Again it attaches like a plug and socket. Just lever it away from the circuit board to disconnect it.
The connector circled below, left, again attaches like a plug and socket. Just lever it away from the circuit board to disconnect it. The other connector is slightly different. The brown part at the top of the connector is a latch. Pull this up, towards you then pull the circuit board away from the rest of the phone and the ribbon will slide out.
Your phone should now look like below. You can now replace the LCD screen. Reverse the whole procedure for reassembly.