Every single director-actor I talked to, from Warren Beatty to Clint Eastwood to George Clooney, said the biggest mistake they made is not shooting enough footage of themselves.
I really liked doing a number of the projects and directors, and etc., etc., I knew about half-way through that I would never be doing that again. It's just not me. I really am happy as a part-time film composer, not a full-time film composer.