I'd say to make sure that the shoe is light. Over the years I've learned that if you wear a heavy boot with steel toes, thick heels, etc, by noon, after climbing up and down ladders, going up and down stairs, and walking in and out of houses, your feet will hurt really bad. Heavy shoes are also cumbersome if you have to crawl under houses. Big clunky boots ALWAYS get snagged on pipes, wires, insulation, and air vents under the home.
Trust me. Your feet will thank you for spoiling them with a light shoe. If you must get a heavier shoe, just wear it when you put the dish up, get the grounding area tied up, and lines installed. The rest of the time between jobs, doing customer ed, lunch break, put on your Reeboks or Asics.