If you do it yourself, I'd get some stainless band style exhaust clamps if your kit doesn't already come with em. It makes it much easier to remove or adjust down the road. I was especially grateful I did this when I changed from my Silverline downpipe to the HX-40 one needed for my turbo. No crimped tubes to fight with.
You'll need sawzall and a damn good and long blade. (Measure many times before cutting)
A good socket set. A set of deep wells will be needed.
As mentioned a can of WD 40 works wonders on the mounts.
The rest of my list paralells WUnderwood's. (Damn nice job, man.)
I will expound on the patience aspect. If this is your first exhaust install, plan on 3 times what you think its gonna take and be ok with that. Drink some beer and have a good time. My first Duals took me a crap-ton longer than 45 min. After twice that I started to get pissed I wasn't done already. Maybe I'm just picky about things. But if I would have planned to take my time vs. planning to be done in 45 min like some told me they did it, I would have enjoyed myself a great deal more and thrown a great deal less tools. LOL In the end, I got it done right and thats all that matters. $.02