There is a lot to consider, as it’s said, once you come out…there is no undoing it. It may be you have some issues in your life that you need to resolve first. Practical problems: work, family, friends. Your life is going to change from the first time you walk out en femme. It is your choice, always your choice. I know one girl who went 4 years before even admitting she was trans.
Get everything in place if you can. If you are going to need laser/electrolysis…it’s a good idea to start early in your transition for practical reasons.
In short, 4 months or 4 years…it doesn’t matter…you will know when you are ready to take that first journey in the world, dressed as a woman. And what a moment it is lol.