Yeah, the screw driver method will probably get it close enough. After you're into the hobby awhile, you'll find yourself buying nifty little gadgets like a prop balancer just because it makes it a little easier, and does a little better job. I typically don't balance props 12" and smaller, but then I use APC and MAS props that are usually balanced fairly well. For props larger than 12", I am more likely to take the time to balance them.