I'd say it depends on the nature of your presentation. If you were not dressed in what the technician would perceive to be over-the-top, he'd probably just take it in stride. If you're uncomfortable with a full presentation or if you just want to test the waters, then choose an androgynous or hybrid look and own it. Just be prepared for him to assume you are likely to be gay, whether you are or not. Give him space to do his work and go about your day. It's your home.
I'm actually a day late in seeing your post and curious what happened. Keep us posted.
