Fear not, Michael.
With every one of these learning experiences you are becoming more educated in the subject of "bus" and with that gained knowledge you will be able to know quicker and more accurately if the coach you are considering is the one you want.
We diddled around making the decision on our first one, but I knew in about 20 minutes the one we have now was a good one to buy.
Except for the inspection process and all of the other things that are a part of a purchase I'll bet the Prevost veterans will all agree they won't need much time to determine if a coach is right for them.