How often should I trim nose hair?
That's entirely dependant on your and your hair growth. Everyone is different and when the hair is very clearly visible or beginning to peak out of the nostril itself, then it's likely time you need to trim the hair.
Can I use facial hair scissors?
It is possible to use Facial Hair Scissors with rounded precision blades for safely cutting nose and ear hair, however, you should always consider how short you're cutting the hair and how deeply you're putting the blades into your nostrils.