RELAX RELAX RELAX!
The more relaxed you are the easier it will be to enjoy. Mind over matter!
Be comfortable with the partner you are with, & be sure they understand TO TAKE IT EASY! Men have the tendency to get in the moment, so make sure your not dealing with a jerkoff who will not take into consideration your comfort.
I would suggest since you are new asking for an advance notice for grk sessions so you have time to prepare yourself for the ride to come

butt plugs are a great idea!
Once you try it a few times you will love it! I don't suggest getting super drunk. Possibly a small amount to relax your body, but If you have a clear mind, you'll be more aware and able to guide & enjoy the trip.
Hope this helps