Welcome to the site Karren! I have been enjoying your posts on crossdressers.com for years, though I haven't been there much since finding this place. I got tired of being told how idiotic I am to believe that herbs can cause breast growth. Besides, these 34B's would tend to disprove that anyway.
I was also not terribly fond of the mods accusing my wife of being fake because she happened to be so understanding of my "condition". Overall, a good forum filed with great people, I just got tired of getting ragged on and called a liar all the time. Great to see to you here.
Holy crop, rant off! I guess I needed to get that off my chest. My sincere apologies to the OP.
I will now attempt to constructively add my 2 cents to the original query. I am about a 34B now, and have little issue with being noticed when I'm out and about. HOWEVER! I have noticed a couple of things. When the wind is blowing hard and I'm walking into it(I almost always wear tshirts, btw), bam, there they are, no hiding them. The front of my shirt conforms to every little feature.
The second thing: if I'm wearing a bra under that shirt, forget about it, no hiding them.
I would reiterate what flame said; weigh your options carefully, this stuff is for real, and when you reach a certain point, if you are uncomfortable with them being noticed, it will be a life changing thing, whether you want it to be or not. It's a very individual thing, some have no problem with the perception of others, some do(in a big way), and some (like me) are slowly making our way from one to the other. I have found personally that I was not entirely prepared for having noticeable breasts, even though I had successfully convinced myself that I was. It is only recently that I realize just how much I had been lying to myself about my feelings regarding how others perceive me. The good news is, I'm giving slightly less of a shit every day.