about how much would it cost to get these installed

Simple to install yourself... don't waste your money paying someone else to install.
Just loosen tension from the drive belt (you'll see that adjusting the alternator's position is what applies/releases tension to the belt). Then remove the four bolts on the crack pulley and be careful not to damage/warp the eccentric shaft positioning plate that is behind it (a plate with "teeth" all around).
The AP pulley comes with a new belt, so just install everything in reverse order.

This should help explain how to apply/release tension to the drive belt:

is there anything else i need to do

is there anything else i need to do

:beer05: :beer: :beerchug: enough said! :)

Just once its installed, start the car and watch the belt and pulley... make sure its not squeaking and the pulley is properly balanced (not wobbly). Do not apply too much tension, but you also don't want it too loose.

You will likely have a difficult time getting the alternator pulley nut off...unless you have an impact gun....other than that it is straight forward

walmart sells a cheap impact gun for around $25. Worked fine for me.

but say i am not able to do this about how much would it cost me

Probably get away with 1-1.5 hrs...so $100-120

do you have any more pics i can use to install the pulleys

do you have any more pics i can use to install the pulleys

staticlag wrote-up a DIY that should be easy for you to follow:
http://www.rx8club.com/showpost.php?p=1375509&postcount=34

easy, trust me i even did my own...as for the impact wrench its not needed u just need a long breaker bar or something togive u leverage... hell i didnt wnana pay the 30 bucks for one and just used one of my old alluminum hockey shafts... worked like a charm!