Yep that lesson's 2nd 1/2 is especially tough, so stick to the 1st if you can do it (slowly as necessary to keep it clean). Truthfully I didn't have that lesson starting out, so my
exercise was the general blues boogie:
Play each part twice through. Start out fretting the A string 2nd fret with your index finger, while continuing to hold it, fret the next note (4th fret) with ring finger...then 5th fret with pinky. For parts 2 and 3, you'll have to use your index to hold the fretted E string, ring for fretted A string, & pinky for the 9,10, & 11, 12 stretches.
E|--------Part 1----------------|----------Part 2---------------------|
B|------------------------------|------------------------------------|
G|------------------------------|------------------------------------|
D|------------------------------|------------------------------------|
A|-2--2----4--4----5--5----4--4|-7--7----9--9----10-10----9--9-----|
E|-0--0----0--0----0--0----0--0|-5--5----5--5-----5--5-----5--5----|
Then play Part 1 two more times, then take the same formation but slide it up on the 7th fret stretching to the 11th and 12th frets as above. Then back to part 2...You'll know how it's supposed to go as you play it (everyone's heard some form of this progression). Give it a shuffle feel, with a downstroke and upstroke. It's as basic as it gets.
[FONT=Palatino Linotype]"Bust a nut!" - Dimebag
"Imagination is more important than knowledge." - Einstein[/FONT]