all of those you can do yourself. brakes might take a while. took me around 4-6 hrs the very first time I did it. Thats in total. and i had a few mistakes i made and had to re-open everything.
to "tighten" the back brake? If that means calibrate. you go in reverse, 15or so mph. (thanks coby) and brake fairly hard. when I did it I made the mistake of completely tightening the star screw thing and it was a bit harder but i hit the brakes progressivly harder and harder and it fixed itself. just make sure you follow the torque specs
rear shocks should be fairly easy also. take a look at the how to on this site, i think i remember seeing one. I know theres one for struts for sure.
as for brand of brakes, ill leave someone else to answer that who has more experience
P.S. this is the first car Ive ever owned thats been mine. and the first one Ive ever changed brakes on (my sisters) and drums were a bit of a challenge, first time, but when I do mine it wont take long at all. front were super easy, but I didnt have to change them. just took everything apart. Also, make sure you open the master cylinder so you can push your brakes easier....and go SLOW