DIY vs. "professional" maintenance

I'll have to plead foolishness if not downright stupidity on my part for not hounding the mechanic every step of the process and not asking when I paid the bill if new seals were used but not itemized on the work order. But I am enjoying all the replies, even though they lead to additional questions and further embarrassment. I've shied away from the RV shops due to typical long wait time and prior bad experiences. Maybe with a few more of life's lessons I'll avoid making the same or similar mistakes again.