Yes and no. If you've built swords for a while you just kind of get an
idea of what goes well where. It all comes in due time. When I was
first starting up though I always tried to make the balance even where
the blade meets the hilt, so I always checked the balance throughout
the build process in hopes that I kept it balanced. If it was too top
heavy, consider what you are using for a counter weight and work with
it. It's all a working process and comes with experience. I can't
really explain it any more than that but maybe Hookswords or Rix could
give you a better explanation.
Like personally I prefer bottom heavy to extreme bottom heavy. That
way the blade just rests in your palm and it's usually just a flick of
the wrist to get it moving. In my build style I use nuts, bolts, and
washers on the bottom to make it that way. It all matters upon your
preference of the weapon for balance. I've noticed that Rix and
Hookswords use a little more top heavy weapons respectfully so if
that's what you would like then message them.