WanaBClapton -
Sorry I'm late to the party. Are you still having trouble with the B7? I had problems with that one when I was a teenager and had problems with it when I started up again. That chord became easy for me over time. I moved on and it seems that the things I learned to play after moving on helped me with the B7. One day I was surprised to discover that I could do it. In time I gained more fretting finger control. In "Full Out Blues" you'll notice that you should already have two fingers in place for the B7. Or should have. This leaves only two fingers to place to complete it.
Finger the B7. Look at how your ring and pinky fingers stack up in a row with your index and middle finger. If you approach the chord with economy of motion you stack your fingers in a row, close to the frets. Leave your finger on 1st fret string 5 when you play 2nd fret string 5. Finger the 1st fret on string 4 (it's just a lean away from where it is now) when you play 2nd fret on string 5. With your stacked ring and pinky fingers real CLOSE TO THE STRINGS fingering the chord while you pick string 5 is almost as simple as dropping them down the 1/4 inch or so right into place on strings 3 and 1.
Keep up the good work. I love BBG. I find it great playing on the porch material. There are many ways to add to these "simple" tunes.
See you down the road!