[MetalMan]

How often you should balance cells depends upon the differences between the cells themselves, and how hard the cells are pushed. You would be fine if you did it every 3 cells or so. If you have a balancer, then all you need to know is how to plug the battery into it.

You don't really "balance" NiMh cells, you more of equalize them. Besides, NiMh is done during discharge, and Lipo balancing is done at the end of a charge. The balancer would plug into the battery just like a PCM guard would.
There is nothing special that could be gained from seeing a pack being balanced, except for the flashing LEDs indicating the condition of each cell.