Alright I had my codes checked and here's what's coming up:

P0705
P0455
P0307
P0430

I have been reading threads on each code, but it seems like there are half a dozen or so suggestions/fixes for each code. I'm on a tight budget and short timetable as I'm trying to go visit my family next weekend. Can anyone give me some step by step instructions as to what to check first, next, last, etc. for each code?

Thanks!