Congrats! You're lucky, here (Alberta, Canada) you have to have GRS to get your gender marker change. And, yeah, you have to show your ID with your gender on it everytime you get a job, do your taxes, go to the doctors, get a perscription, buy smokes or a beer, even to go into a club or bar. Everyone gets to know your transsexual. After GRS, you can get the ID changed, but you can run into red tape and it's expensive.
I'm still trying to afford to get my birth certificate changed almost a year after GRS. I got my picture ID changed last year, and just a few days ago my disability insurance finally changed my gender marker. My name has been changed for three years -- you'd be surprised how often, even after a name change, I will still get mail or a call in my old name, despite several legal letters to change my name even.
--natalie