I think that there are these steps that are basically no return points (unless an impossible effort is put into reversal). RLE, comin gout, presenting female, even HRT are non such points - they are stepping stones on a path. I am not saying there is only one path - for some these reversible steps are enough, working out well, whatever makes one feel right is ok. But we are talking about those two steps that are bigger. Facial hair removal in theory could also count but thats merely an oddity in reversal (does hinter any attempt to retransition after FFS though). FFS and SRS are very different things but also very much similar. I think they both are what I called here rites of passage - irreversible steps that basically have three effects - one is the obvious physical one in respect of how one is seen by others (e.g. better passing with FFS, being able to go to a sauna naked or have intimate relationships after SRR). The next is internal - the way we perceive our own bodies to be, our body image - it helps us to not see our bodies as "male" ourselves anymore (which causes the dysphoria for many). After those surgeries, we look into the mirror or touch or bodies and if we cannot trace maleness there anymore, we are happy and getting less self conscious and feel at home. Some of these two effects can already reached by the non permanent methods like HRT. But the third effect is the one that really makes these surgeries so special and that is their irreversibility. It demands of the one who goes over that edge to have faith, commitment and dedication. Like a child coming of age ritual, this is in a way also a ritual that marks a definite decision to step over a line not to return back under any normal circumstances. This basically seals the deal. For others looking at you (#1) and for yourself looking at you (#2). I believe also that the "magic" happens in the weeks before when ones mind is grappling with this step, when we already know it will happen and we will be on the other side, but not really know what will expect us there but we know there is no way back. Again, I think this is similar to when in traditional cultures a child is coming of age and has to do a ritualistic deed, often demanding something special of the kid, to leave behind childhood and become an adult. The child does not know how it is to be an adult, only from observation. It does know that there is no way back. Thats scary. But by facing that fear, thinking about that step, internalizing what it means and fully recognizing its irreversibility one can reach a point of clarity and readiness to make that step. Its not a matter of the thinking mind then, which already did that decision out of reasons linked to #1 and #2 (external and internal self perception), but it is about being emotionally ready for that. And I think that readiness, that many people in our culture have unlearned to listen to, is what makes such a step successful. After that point, the ritual or surgery is just a matter of practical changes, the real change happens within.
I did not have FFS, but I know that before SRS I had that moment. I did my decision on the grounds of external and internal self perception but there was something nagging at me all the time. The question "are you sure, really sure that this is the way to go". This seriously impaired me as most of my mind did say "yes of course" to that. I came into touch with that emotional part and I cannot explain what happened but at that point, all doubt fell off, I felt like I was ready for it in all aspects of my being and was happy about it being irreversible. How that? It is because it is about the decision and about choice. Once you have done such a surgery, you have no more choice - you are "stuck". the benefit of that is that there is no need at that point anymore to think much about choices - it is as it is. But that benefit can only come if you made that decision in full emotional awareness. Because then that means you are making a decision with all your heart and mind and once the decision is made, all choices collapse to the one you made and your mind never needs to worry about them. In contrast if one denies to be fully lucid about this, one might end up passing through that rite of passage without the effect #3 - and I personally believe that from that point there is that chance of regret coming - from a decision postponed until later or from not allowing the emotional soul to adjust to that change and agree to it. Maybe out of fear that it would not, but this is why this is about faith as well, faith in yourself and in your soul to make that decision in the way you already made.
So really - be nervous - dont simply push that aside and hope that it will go away. It will of course, but i would suggest to use this preparation time before the surgery to allow your emotional soul to come to terms with that step, to let the feelings about it rush in and have faith in that all of your true self will agree that this is a big and right step.
Greetings.