Unless I'm playing in a tourney, i don't walk in florida summer-like 100+ heat indexes anymore. The last time i did i got heat sickness. Dizziness, nausea, diarrhea. No thanks. If for some reason i want to play in that type of weather, i use a cart.
I played a round this weekend. Good news first, of the 5 Par 3's I made par on 4 of them. I doubled the last (200 yds), but it was because of 3 putts and not the approach/chip on within 10 feet. The bad news is that I only hit the 8i or higher well (the same clubs I have swung during my lessons). More good news, not one time during the round did I shank/slice the ball (the focus of my lessons initially).
Using the tools from my lessons, I need to practice with longer irons/woods/driver over the next few weeks. I really feel that I can score lower if I am within ~150 yards on my approach vs. playing a 6i/7i off of the tee to ~225+ and splitting the rest of the hole with my 9i-AW depending on how well I hit the tee shot.