I've been out to myself since April. My presentation is very feminized male, except at work where it's merely somewhat feminized male

. At one of my jobs, I'm known by my female name. I finally got the money together, and later today I'll be giving my lawyer the go-ahead to file for my legal name change, something I've been looking forward to for a long time. I always hated my deadname, even before I knew I was trans.
Today, my car didn't start, and I ran around dealing with auto shops and auto parts salesmen -- traditionally male venues. I don't usually spend much time in such venues; and it struck me suddenly that, very soon, when I deal with guys like this, I'll be dealing with them as *****, a female-only name, even though I still present male. And I felt threatened; and *that* scared me. How, I thought, am I going to deal with this in the very near future?
Just in case there's any doubt, there's no question of my not going through with this. But I'm a little apprehensive, nonetheless. Has anyone else dealt with this, or something similar?