NC,
Don't feel like you're working on a grenade or anything LOL. In reality the caps don't do a whole lot but you can break them if you unknowingly get too heavy handed.
Just lightly snug them as close to the same as you can and don't sweat it. Just check them every so often to make sure one didn't back out any because you may have UNDERtightened it. You can usually tell if one is loose simply by tapping the cap itself and you'll hear it.