I wouldn't wear steel.. your feet would get so tired and sore eventually. I wore steel toed boots forever during the winter time in Colorado... man it was exhausting. Plus they were thick so they did get wedged into my stirrups sometimes!
At least get hiking boots with at least 1" heel. Used boots are fine too, and the barn may have some you could borrow.
I'm glad that you apologized and thought about it some more. Jeans are good but may cause rubs so be prepared!
"Strength is the ability to use a muscle without tension"