Eventual sombody will notice.
And the amount of people that notice WILL be more then the amount of poeple you notice noticing you.
For months I thought nobody noticed me. However when going out with my sister or friends, they became qiute annoyed at the amount of peope staring. This was only 2 to 5 times a 2 hour trip. I on the other hand didnt noice these people. It amazed my sster how I dont notice them.
For the most part I dont concern myself with things I dont notice. And as long as nobody goes out of their way to be rude and make a scene I'm ok. One group however was rude enogh to start vocalising their attention to detail, But one group in nearly two years is good going.
Just go out as and when your comfatable. The term "passing" is more a corelation of ones likelyhood of being noticed. So my exsperiences wont be able to give you an idea of howmany and how often you will be noticed. As far as going to new places en fem, start with places where you know people that your freindly with. example local stores if you regulerley chat with the staff. Thers a chance that freindships could be maintained and even made stronger.
If things go well in these places they could also duble up as safe houses if need be. thus help boost your confidence in your local area, It will also help the neighbours that dont know you grow acustomed to seeing you around.
Also some people can and do react negativly when surprised, I after nearly two years have been aproached by a brother in law that disowned me in attempts to build bridges. If Im honest I think at first he may of thought it was a phase. And after realising it wasnt somthing thats going to go away he came round.
That said, not everybodies exsperiences are going to be as posative as mine.
In short Yes I think people will notice, No I dont think many of them will do more then stare.
Just follow this, If your not comfatable enogh to go en fem by yourself ask a friend if they can acompany you, or if you can tag along with them, if and when they go, eg shopping?
Always let friends know where your going.
Keep your phone with you.
Basically get used to going out en fem, before getting used to being by yourelf en fem. That might make things easyer for you.