quite a bit for some of it. for example, calculating the throttle body airflow at idle requires quite a few calculations. im in no way a stupid person, but some of the tables and functions get quite involved and can be extremely intimidating if you dont have a thorough understanding of what the tables do. my recommendation is to go to
www.tweecer.com and download the caledit software along with a couple eec bin files. you can get a pretty good idea of what you are going to encounter by doing that. also, you can check the tweecer forum at tweecer.oplink.net for some examples of what is involved with modifying functions and tables correctly.