Welcome to Susan's! I'm a newcomer here as well, but just like joining this website, coming out is something we all eventually do. Regardless if it's simply coming out to friends/family or if you're coming to terms with yourself about these new changes, there will always be someone out there that can relate and be helpful! I have to agree that is kinda becomes a snowball effect, mixing excitement with nervousness (and other emotions!) and just seem to explode ( in my case implode) all lat once. I wish you the best as you take the steps and path to becoming the person YOU want (and feel comfortable with) :]
Have a Lovely Day!