Help with fainting episodes

I am a first year nursing student, and have recently found out that I experience vasovagal syncope episodes when observing venipunctures. I'm trying to watch as many as I can to hopefully get myself used to it. Any suggestions?PsI'm fine with lacerations and everything else except simple venipunctures. I can watch them on babies and children, just not adults. I have no idea why either.
We can't provide medical advice but from a practical standpoint:1. Tell your instructor ahead of time. 2. Sit down when observing blood draws. 3. Leave quickly and quietly if you feel the need.

Take slow deep breaths while watching. Sometimes we hold our breath without realizing it. Try to sit/stand away from the crowd so you don't feel closed in.