I had three main concerns/discomforts which I am still overcoming.
Firstly, the financial aspects of my desired journey. I want to have surgery, definitely top surgery and perhaps one day bottom surgery if the procedure advances and becomes better for FTMs. But I am having SUCH bad luck with finding employment, and although I am on private health cover, it is still a lot for me to pay. I try to look past this by reminding myself that I'm young, I'm still studying in my chosen career field and it is hopefully just a matter of time before I find employment.
Secondly, and this might seem kinda silly to some people, I have a LOT of female friends. I am more comfortable with my female friends than my male friends. I do have male friends, but I find that conversation can often be limited and sometimes uncomfortable. This was more prominent pre-T than it is now, but I am still adjusting. I didn't have many friends growing up and when I started to make them, they were majority female. I'm worried that I will never be able to make proper male friends who I can do "manly men" things with.

But it's getting easier.
Thirdly, the adjustment my friends and family have made/are still making. It's always been a flaw of mine to take into consideration the opinion and thoughts of others over what I want, and transitioning was kind of a "f*** you" to that side of myself. I wanted to follow how I felt, so I am doing so - but some friends just get inappropriate occasionally with the "wow, I've known you as a girl for so long, this is so weird! I don't know what to call you!" and in my head, I'm always yelling back "How about you call me a f***ing male?"

I get frustrated, but I cool down and remind myself that they are adjusting and taking this journey with me. I was very uncomfortable at first with transitioning from a comment my mother made - that she was "loosing a daughter and gaining a son", and being a child, I couldn't understand how that made sense, even from a parent's perspective. As I've gotten older and matured with this process, I can see what she means, and I learned that she is making changes to help me, even if they are difficult for her, and I have learned to appreciate her efforts, past, present and future.