firehawk933

I am preparing to install headers and an catted Y on my 2002 Firehawk. I am not too mechanically inclined but I understand that LT's typically cause a rich condition. There is only one local shop that offers dynotuning but they have no reprogamming software to adjust my car. They basically told my that if I brought a laptop and program they would give me my readouts and I could make adjustments myself. My question is:
What do I need to buy to adequetely tune my car keeping in mind that this is all new to me.? Is there a beginner freindly program that is reasonably priced?
I would much rather take it to an expert and let them do it, but I can't find anyone! What should I do?