Some really good advice in this thread and - importantly - told with humor.
The humor IS important. If we can't get an occasional chuckle out of ourselves or our friends about some of our transition experiences, the alternative can be to buy into the fear.
There can be some scary moments in transition, The first time I boarded a ferry for a GID counselor session in Seattle, I was sure they'd (the ubiquitous 'they') would kill me and throw my body overboard into Puget Sound. 'They' didn't, and I received a mix of glances, stares, and warm smiles. That story has been published in a TS book.
Later, as I found my hair and clothing style, I developed a weapon against the stare. It consisted of a bright smile at the person and a steady onward pace. Note the past tense. Now if a guy (usually older) or gal stares, my husband says it's because they're checking out a foxy older woman.
The first thing to change when I began transition was my walk. Without any conscious thought, my walk changed from a long stride to shorter steps. I did take a 6 week group voice clinic at the U of Washington, which helped with style and gestures, My pitch went up 3 notes without knowing how, exactly. I'm in the gender neutral range and almost always get maamed on the fone, even with a gender neutral name.
So things work out over time. Try not to be self-concious. Be ready to look passersby in the eye with a smile and even to laugh.
Oh, and crossing your legs? Not to worry. The important thing is to keep your knees together while letting your legs assume a comfortable slant (both feet a little to one side or another). Try it.
Enjoy the journey.