I am a self taught guitarist for about 4 years and I want to get some more books to help me get better. Some things I want to learn it to be able to shred faster and learn to improvise (especially in a church setting because sometimes at church I have a few bars to make up a solo). Some books Im looking at are
Advanced Guitar Theory and Technique Applied to the Metal and Shred Genres by L. Herman and Shred Guitar: A Complete System for the Rock Improviser, Book & CD (Contemporary Guitar Series)