Unsolder the tail motor and pull the wires through the boom(From the front of the helicopter)

Twist the tail motor/rotor housing holding the main frame of the helicopter till either end breaks loose. Then using pliers, or something to hold the boom, twist whichever part didn't come off before till it breaks loose and remove the boom.(By break loose I mean any glue that was in there loosens)

If it's stuck in there real good squeeze the boom till it breaks apart at the end you're trying to get out and pull it out. If there's bits of the boom still inside use a screw driver, or drill bit, to remove the extra.

When putting the new boom in just put a drop of glue on each end where the carbon fiber meets the plastic.