brakes....

Not really, just a good selection of common hand tools
screw drivers ,hammer, pry bar,wrench,sockets,.
( brake tools can be rented locally)

the key(#57) should just slide out with your fingers or pliers,if it doesnt make sure the adusting nut is backed off and centered to allow the key movement.

for the adjusting nut (#58 ) I use a punch to spin it off( use one of the holes to insert the punch head into and turn)

Clips can be removed with a screw driver.
seals can be installed using the old ones to drive them in.
or you can rent seal installer.
where are all the machanics here to help out

so i need new seals as well??

Its up to you..
I think it is best to replace them, they could be brittle and crack when disassembling the rear end, they could be the original seals ?.
could start leaking onto your new brake job.
seals are cheap insurance.

Get an estimate from a dealer/shop on what a brake job cost and parts they will use.
you can save a lot of money $$$ doing it your self

Just my opinion and friends that work at shops.
Do it once, do it right, never think about it again.