You can drive around with some octane booster for a while but eventually you are going to want to get some kind of electronic tuning aid (Hondata, V-AFC, etc) and have it dialed in on a dyno.

The only way to really tune a car without a dyno is to install both a wide band oxygen sensor and a tuning aid, then datalog off the w/b and make adjustments accordingly. But a wide band oxygen sensor is going to cost more than an hour of dyno time with tuning.