Where is the IV placement site for a colonoscopy?

I'm having a colonoscopy done next month and I'm terrible with needles, but am okay when they're placed on a specific place (On the crease on my right arm) since the rest of the area on both of my arms is EXTREMELY senstive, something the doctors can't explain. Anyway, the hospital I'm getting the procedure done at (a children's hospital since I'm only fifteen) for some reason almost always places the IV on the hand, even for ER patients (something I learned the hard way) Those that have ever had an IV in the hand know how painful they are compared to other sites. So, I was wondering if anyone knew where the IV is usually inserted for this procedure so I can wrangle my way out of a painful experience. Thanks so much for any help you can give.