Better yet is the mini trained to ride? Many aren't. Get a professional to help you. Someone who knows horses. Horses can be dangerous. Even small ones. I have minis (as well as big horses) and my husband thought of them as dogs until he had one land up on his head. His response was, "WOW, they are just like big horses! Only faster."
Just my .02 worth.
And there are never any stupid questions. Always better to ask and find out the easy way.