it´s hip hop, it´s easy, be calmand try to keep things under control even if you have to be slower.
If you want to tell them you´re new in the studio, it depend on you and how you see they take it. Most of the people would understand it, but every person is a diferent world.
You just try to do things as good as you can, and the most important thing is to stay cool.
Hope may help!