In the short term, rehearse well with as close a simulation of your eventual stage as you can manage, or use prescription or nonprescription anxiolytics, or try one of the many speakers’ tricks for reducing stage fright. Most of the latter probably won’t work, but some might.
In the long run, the best way is probably exposure: doing a lot of public speaking, perhaps in front of progressively larger audiences.
In the short term, rehearse well with as close a simulation of your eventual stage as you can manage, or use prescription or nonprescription anxiolytics, or try one of the many speakers’ tricks for reducing stage fright. Most of the latter probably won’t work, but some might.
In the long run, the best way is probably exposure: doing a lot of public speaking, perhaps in front of progressively larger audiences.