I wouldn't recommend using the herbal/estrogen cream stuff--they're overpriced and won't do as much for you as (the significantly cheaper) testosterone blockers, estrogen, and possibly progesterone would.
The hard, painfully sensitive lumps under your nipples are normal for trans women who've just started hormones. For me, they went away as my boobs started growing, but without the testosterone blockers, and using something as sketch as homeopathic/over-the-counter boob growth stuff, i'm not exactly sure what would happen to you w.r.t. that.