Fix Fault Squier

i have got a squier strat and some of the frets are worn down how easy it to refret with new fret wire could i do it myself if what would i need to do it.

my fender squire strat keeps making this annoying buzzing/electric noise when i plug it into the amp, had to fix the wires before because they came undone from something so i just put them back, did t ... more

THe input isnt working and there is a cord hanging out the back by where you put the strings in

Can anyone tell me of somewhere I can get another Machine head/Tuning peg in U.K. for a sqiure strat? Roughly how much as i've seen one on a u.s.site priced at $37-ish!!!!!