Make sure you discharge any static, as was mentioned. You don't necessarily need a wrist band or anything. I work on computers a lot, never shocked once.
Anyway, as you are building your own for yourself, you want to be clean and careful. Gently apply force, make sure things are going in in the correct direction. For the clean part, most components come in anti-static bags. Take the components out, but if you have to put them back down, use the component back as a surface to put them on.
Carpet is okay, but not recommended. A table top, like a large, cleaned off kitchen table or kitchen counter would be a great surface to work on.
Oh - never work on the computer with the power plugged in, and especially with the computer on. (It can be done, but I highly highly recommend being careful about that).
those are great advices...thanks!