People who have transitioned and then had kids. How difficult was it? If you could do it again would you have kids before transitioning?

I am wanting to transition (MtF) but the infertility aspect is my main roadblock right now. I can store a sample, but I don't know how effective that is. I could look into adoption later, but I don't know how hard that is as a trans person. Im just looking for any advice about the possibility of having kids after transition and what that looks like. Right now I feel stuck because I want to transition but I feel like I can't because of this. Thanks so much.