I just want to make sure I dont mess anything up. I see where some other people have had issues here on the site when flashing these PCM's

Im probably going to have the Dealer update the PCM with the Latest firmware to fix the idles issues this car is having (As they have rectified the aging Cam modulator with PCM updates) then do a read and make some further modifications to the computer.

Any suggestions to being successful?
-other than updating EFI live to the latest version before starting.

Thanks