You're not alone. I was a bit unsure about the changes i would need to make (though i wasn't unsure that i was a man - i'm still sure that i am... did that make sense??)
My therapist told me to try to picture myself in the future and make a detailed "report" on what i saw over the next week. Try to picture myself - what role i would have and such. What i would look like (though it's hard to picture ones self physically as it's all a crapshoot), what i would wear, what i would be doing. The way she said it - "would you rather be the one on the back of a motorcycle or the one driving it?"
I was thinking - "uhm... wouldn't mind either, actually, though i've been DYING to take the course at my local college that teaches you to drive one!"
Problem is, we create our own roles and there is no such thing as "male role" versus "female role." Times have changed SO MUCH and anyone can have any role. I mean, come on - my UNCLE is a stay at home dad while my AUNT works and brings in the money! You can be or do anything you want.
It was a parting shot or i would have told her all of that last session lol.
Picturing what you want to do can help, though. I mean, i certainly don't see myself as the "stay at home wife" or "stay at home woman." I can't picture it. I plan to be active in a career and actively working to educate the public in regards to dogs (rescue work and such.) I would have my days off, yes, but i wouldn't like staying home and doing housework.
I do not see me doing any of those things as a woman, either - no skirts for me, thank you very much! Nothing feminine either. I also don't see me doing any of those things unable to say for sure that "i'm a man" or "i'm a woman" - i just don't see myself as being as androgynous.
So that's my answer for my therapist in a nutshell.
It's normal to go through periods of doubt. Do you have a therapist yet? That may help a bit. There are also many ways to transition - slowly, quickly, certain things but not others.... I plan to take the hormones, do all the legal stuff that i can to change name and gender marker, and at some point i want to remove the chesticles.
YOU don't have to transition at the same time or in the same way as ME (or anyone else.)