DaRock is correct. I often make light of balancing props, but of course, it's never a BAD idea.

The only reason I often joke about it is to show the beginner that it is not something they HAVE to do just because their planes instructions tell them to do so.

Obviously, if you read your manual, and they tell you to balance the prop, a newbie will often think that balancing a prop is an important step that they MUST DO before they can continue - it is not - especially for a beginner who is flying a trainer (On some of the EXTREME SPEED Planes, it is VERY important, but it will be a long time before you get to that level if indeed that is even the direction you want to go in this sport)

Balancing your plane on it's Center of Gravity (CG) is VERY important, and that step should NEVER be skipped, but balancing your prop? Don't lose any sleep over it.