Surround yourself with theater. Take in as much theater as you can, and from as many perspectives as you can.
Volunteer to crew a show, act, be an assistant director, help with spotlights, seat people before a show and take classes at local theaters.
The language we use to do to do our jobs spans across a lot of areas (audio, acoustics, electronics, technology, psychoacoustics, music, film, and more). Our clients, on the other hand, may not have much language to convey what they want. The mix notes I get may be as broad as, “I don’t like that” or “something doesn’t feel right.”