I tuned my car myself on a mates dyno. It certainly a slow process. We tuned it at light throttle, zero boost then at full boost at all rpm levels monitoring this by the map trace. Increments of 400rpm made this a slow process. During this we altered A/F ratio levels. I noticed we didnt really alter the timing levels just making sure there where no funny movements on the ignition map. As load increases , timing is pulled out which should be in factory tune. A/F ratios where very rich so we picked up alot there. Overall its a great experience and now i fully understand the functions of the power fc in my car.
Experiment with it, but you really need a dyno to see what A/F ratios are. It took us at least 3 hours.