#1
iknow i wont get an exact figure from u guys but i just want an approximation (in GBR pounds) how much it will cost to get a humbucker fitted to my strat copy in the bridge postion leaving 2 single coils in, and how much i would be looking to get it wired like a tom delonge with just the one humbucker, i already have the parts needed so just labour
#2
You'd need to decide which pickup you wanted first, and you could probably do it yourself. All you need to do is solder a few wires together. Failing that, your parents might be able to do it if you trust them with your guitar.
A dwarf might hear you. What then?

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#3
Youd have to ask around where you live, because every repairman is different. I Replaced my Pickup and it took me a few minutes...just make sure you get a book and some advice or help when you do