There is a difference between being certified and learning to clean hoods properly. Sign up for the HOW TO CLASS if you need it. Grant is correct about the upcoming changes. Save your money until the real AHJ comes into play. I PICK DOOR NUMBER 2.
Work with a company for a week or so. Contact someone out of state that would be willing to train for free labor. This way you can get a idea if you like it plus gives you some knowledge of what is needed.