How do I balance a three blade prop. Thanks in advance.

I've not done one. Same way as a 2 blade, right?

The more blades should be easier. Lighten the lowest blade or add to the top blade. Maybe I'm too simple. I've only balanced a few props.

Put the prop on your balancer. If the lowest blade isn't hanging straight down, take material off the lower of the other two blades until the heaviest blade does hang straight down. Then take material off that heaviest blade until it matches the other two. Easier by far than balancing a two blade.