There are expose to be some good witchdoctors down in New Orleans, but you can do it yourself, you just need to summon a demon. Its easy if you email I'll tell you how (I've never done it though.)
If you are looking to play the guitar I heard of this place in the USA that you can go. (don't remember exactly where) Its a crossroads that line up perfectly with a compass. You need a chicken and a sharp knife. You chop the chickens head off and it will run around the crossroad clockwise. Then dig a whole and place the head in the whole. Then chop your fingers off your left (or right depending on which and you use to work the riffs) hand. Place them in the whole and wrap your hand to stop the pleading. Say some words (not sure what they were) and about every 2 weeks you will see the nubs on your hand growing longer. Eventually the fingers will grow back and on each finger tip will be a black dot. A crescent moon shape. When you pick up a guitar all these notes and songs like no one has ever heard before will pop into your head.
You will be able to play like no one has ever heard. You will become a legend. Supposedly some of the greatest guitar players of all time have undergone this ritual. You would have to research into it to get the details.
PS
Not liable foe any injury that may occur. This is a legend. Do not try this at home.
P.T. Barnum was right, a sucker is born every minute. I doubt they have guitars in hell. BUWAHAHAHAHAHA! Yeah, you have crazy guitar skills but no guitar to play them on!