You aren't the only wuss, this heat makes for a long day, and shortened rides, Gabby.
I don't have riding boot, but wear a size 16 Buster Brown's so if the foot swells up let me know which shoe you need. When I was in high school rode with a full cast on my right leg. That is till my mother caught me. The bike's kick starter was stripped so I would let it roll down a hill to start the bike at home. Sounds like you have been around a little so can probably take it and give it right back so you should do fine on this place.