Adam,
Unfortunately we have to mistakes in this hobby to learn. (much like life in general)
If someone tells you they have never been burned or made a mistake then they are lying or conveniently forgetting the truth or they are the "Bubble Boy" and have never been outside that little bubble!
If you PM me, I will tell you my TPG trimmed horror story "lesson learned" and it was painful!
Take care.
Peace, Mike