Keep calm. The sight of blood can be distressing. Be calm and take slow, deep breaths.
Make a 'thumbs up' with your hand. Use your right hand if bleeding out of your right nostril, left hand for left nostril.
Press your thumb firmly against the side of your nostril. Don't press so hard that it hurts, just firmly enough that the nostril is flattened and closed.
Sit or stand still. Lean forward slightly to stop blood running down your throat.
Hold your thumb in place for 5-10 mins. Breath normally.
Release the pressure on your nose gradually. You may feel a funny sensation as blood flows back into the vessels in your nose.This is an easy way to stop an nosebleed. This is to be used when you have no tissue.