Codes P0507/P0410/ Questions Re: Your Reply on Sept. 7.2012 and S

Hello again,
On Septrmber 7th, 2012. You guys replied back to me on My needed to run a Diagnostic Sxan tool on my 99 gmc Jimmy to Diagnose my problems and p0507
p0410 trouble codes and Complete Instructions on how and what to look for. And I Thank You. I have found a Mobile Mechanic on Craigslist who has that Scanner and says he will do it for me fot &60 per. Hour. I am Hurting for money Real Bad right now and cant afford it at all. BUT, say I get up some money, How Long do you think it should take him to perform the whole test (the longest it should take) and when test is Complete, will he infact be able to tell me the probles? As Where, What and How to Fix the problems?
I just dont want to be Screwed over and taken Afvantage of, because I am a Woman, Ya know? I just need to know what to exspect andwhat I should be getting for my money. First he said 1 hour and then when I told him that I only wanted jim to tun the Test and Diagmoise it, then he went to say 2 Hours or longer. I think it is something as little as a Vacuum Leak or, I know the AirPump does come on and run. I cant afford to hand out even just $60, much less $180 to be told it was only a vacuum line. Please let me know what you guys think ok? A.S.A.P. Thanks Again Guys!