what Steve is saying is you need to have an understanding of the tuning process, the sensors involved and how the PCM uses them. You can't just "get a tune" and start tuning.
Recommend you read through the Stickies above (
http://www.hptuners.com/forum/showthread.php?t=4742) on the basics of MAF/VE tuning. Pour through the 1,000's of threads on the subject using the search mode to specific topics. Also there are several great books on the market. I recommend the 2 by Greg Banish
Greg is a certified GM Calibrator and frequents this forum from time to time giving help as well.
Once you have an understanding of the PCM and how it works with the various sensors (MAF, O2's, MAP etc), you can begin the tuning process and as Steve says, ask questions relative to specific issues.
Most of us started this way. Before I got my HPTuner, I couldn't tell a VE table from a Dining room table...now I can tune 800 HP, Supercharged A6 automatics to idle at 875 rpm and get 20 mpg. It will take some time, but will be fun in the journey. And remember, you have the forum and all the great tuners like Steve, RussK, soundengineer, Greg, etc. to ask allyour tuning questions to.
Good luck and let the games begin...
Ed M