Get a wideband if you're going to tune it yourself. Also, make sure that you've got gauges.
The most important thing about tuning is to do it in small increments. Adjust one thing at a time and be careful. Know what you're changing and why you're changing it.
I would tell you to invest in some dyno time, but if you're going to street tune it, make sure you have a friend with you to drive the car while you make adjustments. Don't tune alone, it's a pita and it's dangerous too.
My car is well, it's like 10 lbs of shit in a 5 lb bag...
<------ Click to see what I'm workin' with. ;)