#1
But how the hell are you suppose to play those strumming things when it's written like this:

e|-------------------------
B|-----0----0----0-------
G|-----0----0----0-------
D|---5-5--9-9--7-7-----
A|---3-3--7-7--5-5-----
E|-------------------------


Could someone tell me?xS
#2
for the first power chord, play the two notes like you would any normal power chord. then when you play it again, play the power chord and also the two strings below the chord (leaving them open). repeat this for each of the 3 sets of chords. it may take a bit of practice to do it without having the high e string ring too but take it slowly and your control will increase.
#4
the formatting on your tab is off, but I can't see what the problem is. It should be easy to hit the open notes, there's no holding down of the frets necessary.