Personally (as I can't talk for anyone else) there was a bit of an ebb and flow, complete with occasional "what on Earth are you doing?" moments. It might help to write down the whys and wherefores when the dysphoria is in full flow. That way when things are calmer you can reread them and check if they are still valid. Even now with over two years of full time experience behind me I will still get an occasional "are you sure?" moment. This soon sorts itself out when I ask myself "seriously Rosie, do you want to go back to THAT?"
Or you may not be trans*. Good for you if you aren't 'cause it's a right whatnot of a path.
Rosie