Just got my blackberry 8520 curve and I have no idea how to set a alarm to wake me up tomorrow morning, thanks. :)
(2 or 3) handles or one single lever? If it's one lever, then you need to remove the internal cartridge- inspect the washers and o'rings- see if they are worn- also look for any debris that may be stuck inside the cartridge or shower valve housing. If it has 2 or 3 handles (a hot, a cold and maybe a diverter knob), you need to disassemble them separately for the same inspection. If the water streaming out of the spout is hot, then you'll know it's the hot valve you need to work on. The 2 or 3 handle shower valves may be cartridge or regular type stems- the 'regular' type stem being the one that has a washer at the base. If you could be more specific as in the type of shower valve and number of handles, I could be more specific in a repair.