So today I bought a secondhand guitar, it retails at about £370 but I got it for £60 cause the guy I bought it from bought it secondhand as well and it has a custom paintjob he doesn't like. It plays beautifully but the pickups have been replaced. They used to be ESP humbuckers and now they are ESP EMG look alikes. The tone knob is broken, it is either all the way on or all the way off with some crackles in between, the knob itself moves fine but there is no change going down until right at the bottom where it gets into a muddy sort of tone. When the tone is on full there is a bit of an audible buzz that isn't there before. Is this a DIY job or a music shop job? I've never attempted many repairs before. Also how much should I expect this to cost me if I do go to a music shop? My local one attempts to rip me off every time... once I went there to have an electronical fault looked at on my fender bass and the cheeky monkeys changed the strings and asked me to pay for the new ones and the labour price! Thanks in advance! I know this is a question about guitars not basses but I don't really trust the gui****s at ultimate-guitar.com and I figure the electronics can't be so different! So feel free to move or delete if it's in the wrong place.