I used a simple pencil point in a vice then bought a commercial balancer for about $35.00. The pencil point works just as well. I also found all DJI props to be in balance while two sets old carbon fiber props were not.
Just suspend the pencil in something, either vertical or horizontal and add the prop to the sharpened point. The heavy side will rotate to the bottom. Simply sand off some material near the tip to bring in balance. Or you can add tape to the lighter side.
Don’t fly without balancing for sure.
Good luck
Jim
WA5TEF