Tomorrow I am going to have to change the fuel map in my Power FC prior to going through emissions. Does anyone have any helpful information that I should know to help make this a little bit safer. I'm a little scared, as I have never had to do it before. (I don't want to toast my engine.) I, don't know how much to change the values, or which ones will be necessary. I have copied my entire fuel map into an excel spreadsheet so that I can restore it immediately after, (before I leave emissions).

2k mi. on turbos
30k mi. on engine

Mods:
-Pettit intake
-PF intercooler
-Downpipe
-High Flow cat and exhaust
-Power FC w/commander

I would have a qualified shop here do it, but the nearest place, that is qualified, is about 500mi. away.
Has anyone else out there been through this?