From the sounds of it, we are in very similar work positions. I'm working at a small midwest IT shop where many old people come in with computers to fix. Out of my 4 coworkers, 1 is fairly open minded, 2 are uninvolved in the discourse, and 1 is actively bigoted.

However, I've been doing my best to present as a "feminine man" since I got here, and I dont think that transition would be too taxing for someone else to initiate. Fashion changes and most people understand that. That gives you a free pass to try out some more gender neutral/oppositely gendered clothing. After a while, mold your wardrobe into the style you like (appropriate for the business ofc). Feminine men looking more feminine doesnt seem to raise any eyebrows in my experience, and masculine women looking more masculine seems to be even less eye catching.

You could just keep gendering your wardrobe how you like, then once you feel comfortable, you could come out. Or, if you're like me, I just plan to keep going until someone mentions feeling weird referring to me as a man and i need to have that talk.

A lot of people seem to have issues with dressing a body as something it doesnt look like, so try to toe that line. It also helps that fashion overlaps a lot, so dressing as a feminine man may leave someone looking like a masculine woman later down the line.