Properly balancing planes with tricycle landing gear

I'm about to build my first plane with tricycle landing gear. Such models tend to be tail-heavy and hence need weighting in the nose to keep them balanced properly on their landing gear. The model's instructions don't give me any guidance on this. Is there a rule of thumb to figure out how much to add? The nose of this plane is relatively small, and I don't want to add more weight than necessary, to avoid any chance of the nose getting deformed.

Also - is it best to put the weight directly over the nosewheel (if there's a place to fit it), or to put the weight as far forward as I can (which would require less weight, I think).

Thanks.