During my time playing the guitar I have practiced with friends and seem to be pretty knowledgeable around the guitar fretboard.

I have studied at college. Firstly I studied at Clarandon college in Nottingham
which was exciting.
I studied blues guitar for a while.
Finding out which cords fit in music scales, is one of the hardest thing to learn.

And there's playing songs infront of an ordnance which at first you can be a little bit nervous at first.
Then there's playing from music tablature
which can be interesting given time to learn.