How can I know if I won't regret sex change treatments?

Well, I guess you really just need to make sure this is what you want. It's for sure a big decision! Just consider if you're ultimately gonna be happier going through with it, if you're going to be more comfortable with your body with the treatment. If so, then you probably know the answer. Good luck!

Perhaps you don't know. Life is always risk-taking. It's most important to go by what you feel right now is valid.

Well, ask yourself if you truly feel like you're transgender. Realize that you can't turn back. But, the treatment could possibly make you truly happy.

It's best to take as much time as possible before medical transitioning. While I'll say I'm so happy with my transition, there are people that realize it wasn't for them. Not all people with dysphoria think that transitioning was helpful for them or they felt rushed and pressured into it. That may not be your case, but it's best to look into yourself critically and think about what your dysphoria is, what causes it, how transition would help it, and if you want that for your life. Trans people do not have to medically transition to still be transgender! Surgery and hormones can be expensive or just not wanted, so don't feel pressured!

The best you can do is not make any serious commitments if you're not so sure about the decision. If it feels right and you're confident about the procedure, then you probably won't regret it later on.

You can always go through gender therapy or through a regular therapist to reassure that you won't or discover that you will.

It's often hard to tell before starting medical transition, because in my experience and that of other trans people I've known one of the clearest indicators that you're not on the wrong path is the effect of hormones on your mental state. This is often, but not always, noticeable within days or weeks. It's not always clear where your head will be before treatment, but if you're questioning it's often helpful to look at pros and cons, and potential other causes of the distress you're feeling. For example, while trauma does not exclude the possibility of gender dysphoria and they are in fact often comorbid conditions, it is possible and has happened that people confuse gendered trauma with gender dysphoria. This confusion can also come from things like isolation and feeling unliked, homosexuality, certain kinds of obsessive-compulsive disorders, dislike of gendered expectations placed on you, and so on. While many of these are very common experiences for trans people, if they sound like you and you are unsure of your identity, they are worth reflecting on.