Changing the fuse in a 13 amp plug is a very easy task. But remember:
Never attempt to do this with the plug inserted in a wall socket or plugboard – UNPLUG IT FIRST.
Replacing a fuse
Firstly, it is important to replace the fuse with the correct rating fuse, Don’t assume the one that is in the plug already is the correct rating, see this article on choosing the correct fuse.

Moulded plugs
Modern appliances often come with a moulded plug fitted. It is not possible to dismantle this kind of plug. You will see a rectangle shaped insert on the underside of the plug, using the two small slots on each side prize out the fuse with a flat head screw driver. Remove the fuse from its carrier, place in a new fuse of the correct rating and push the fuse carrier back into the empty slot.
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