I had a lot of starts and stops at first from my own indecision. I've been obsessed with breasts my whole life and the idea of having those curves *really* appealed to me but then it was like 'what the hell am I doing, I must be nuts!' and I'd stop but I always came back to it.
That lasted a full year and at the end of it I only had a small amount of growth but mentally I was able to acknowledge that this was something I really wanted to do. So in that regard it was beneficial for me to go slow at first.
Currently I'm just an a-cup but its pretty noticeable if I'm wearing any kind of tight t-shirt, especially the nipples. So far no one's called me out on it but I don't currently have a girlfriend or go to a gym or pool so they haven't been on full display.
As I get more and more comfortable with my shape I can feel my confidence grow with regard to dealing with what others say or think. That's easy to say and it remains to be seen how I will react if I get a negative comment or look of disgust from a good friend or family member but honestly I think I'll be ok. This is who I am and it's on them if they can't deal with it.
btw...Regardless of how fast you decide you want to go your body might have different ideas. Those males that get c-cups in a year are a rare (and lucky

) breed.