How are you doing it?
Do you have a plant in another room that you are forcing herms on? If so, then you can just take the female that you want to pollenate out of the room for the pollenation, hold her there until it 'takes' and then wash her off an return her.
HOWEVER!!!!!
If you are forcing herms to 'self' a plant, then NO get it away from your other females.
anyway if you are doing it with light cycle, you're gonna herm all the plants.