I know a lot of people have replied to this so I guess i am just agreeing with them. Having so much hospital exposure and blood work and such, your veins are so precious. It is DEFINITELY withing your rights to ask for an experienced. I have done this too, as my veins are pretty scarred. Don't be afraid to put your body first. Don't feel bad either, because I have friends that are in med school right now, and they say that if a patient takes charge they are more likely to understand what they are going through/having to work with. Take care of your body, and let other people know that you are taking care of it as well.