Tools required: Torx 6 screwdriver, plastic tool such as a credit card or guitar plectrum
First remove the battery cover, battery, sim and memory card. To remove the camera surround you need a tool with a slight hook on the end to release two clips (circled). I had a special tool but you can improvise with the end of a key or a fork or something similar.
Gently pull back the two clips which hold the camera surround in place.