simple belt changing advice needed...I am stuck

[DamnedButDetermined]

I have bought three new belts for my 90 fastback, and i see that two of the belts have idler pulleys for tightening them, but the alternator belt does not. so here are my questions...

Is there a certain order i should remove and reinstall them?

How would i remove the alternator belt?

How do i tighten the alternator belt?

I have a custom CAI made out of pvc, and it is very hard to remove and reinstall, so is there a way i can leave it in place and still be able to get to everything?

Is there any type of addative that i should add to the belts before installing them (like belt dressing or some kind of preservative)?

I have read two different things from many people so what is the correct way to tell the belts are tight? 1/4" movement over a 7" span or an 1/8" ?

thanks