Before you get started, get a can of PB Blaster and hose the bolts down everyday a few times a day for a few days if you think rust will be a problem. This especially goes for the upper bolts on the rear. I can't imagine trying to drill out a busted bolt up there with as little space as there is up there to work with. If you remove the plastic shrouds in the rear wheel wells then you will have better access to the top of those upper bolts (they are only fastened on with those Xmas tree plastic fasteners that are super cheap to replace). I also think its easier to remove the respective wheels, it just gives you more room to work.
You'll need a 15mm and an 18mm socket for the rear lower bolts and a 13mm on a long extension for the rear upper bolts.
I believe the front lower bolts are a 13mm also. For the front upper, I would get a shock nut removal tool. They are a socket inside of a socket if you will. They cost about $8-$14 and can be found at O'Reillys, Quadratec, or JCW. This tool is a genius solution to the piss poor design that the industry decided to use at the top of our shock mounts. My biggest advice is to soak the hell out of all the bolts first with PB Blaster (accept no substitute, wd40 and liquid wrench pale in comparison).