Just remember to do your forging around room temperature.
Unlike steel, it is not a good idea to form brass while it is hot. Most brass tends to crumble when formed hot. This is because most, not all, brass has a percent or three of lead in it. In sheet or plate the lead is there for improved machinability, in castings it helps make a sounder (if not stronger) casting.
Brass does harden with cold work/forging, now & again you might have to anneal it again.