Fear.... is good. Face it, transition aint for weenies. The older you get, the easier it is to say to yourself "I made it this far....."
But what is the real justification for feeding or justifying that fear? For me it long was my old drinking buddies, Shame and Guilt
Like others here, I spent 50 years avoiding fear burying it under piles of diversions, distractions, booze, and food. I also twice experimented with transitioning in my early 20's. Twice they ended because I figured it was far far easier to fake being a guy then being some guy in a dress.... Shame
When a lifetime of this caught up to me six years ago I realized it was how I was NOT handling being trans was the root cause of much of my misery. For me the answer was clear, I needed to figure out how to get these two great aspects of myself to peacefully coexist inside me so I can be one whole, healthy, and happy person. That was my quest, not transitioning. In fact it was the absolutely last thing on my list. Been there, tried it twice.
A funny thing happened on the road to happiness. I accidentally veered off into transitioning. To be clear, for me "transition" is more of the dictionary variety. I began to change. I fought and overcame a fear, enough to take just a Baby Step and it worked. I became happier. Cool, let's try another one. Hey that also worked.
Eventually I reached a point where baby steps were becoming leaps of faith. Coincidentally, that same time overcoming fears became far more complicated and frankly, unresolvable. Also involving great leaps of faith.
As my wife and therapist both like to remind me.... I cannot predict, much less control the future.
Fear is good. Provided it does not rule your life. Transition can and does involve great risks. As with anything else in life, there are no clear cut answers. One needs to balance the potential rewards against the potential losses. Or, as my inner pessimist puts it "Which Pain is Worse?".