LOL the problem doesnt have to be MAJOR for you to blow your engine.............Hell it could not even be noticable while driving to most people. Dont think failsafe mode is going to save your ass, because it wont. You think most people REALIZE their engine is about to blow???? No, they have this look on their face like, "wtf just happend?!"
Not trying to come off as an ass, but it is an aquired skill. There is training involved. and ALOT of research. Professional tuners don't just say hey, i'm gonna buy a tuning software and learn how to tune myself. They go to school. Good luck doing it man, i'm sure you will get it figured out eventually, just gonna be a bumpy road for you.