How do you get on that rollercoaster so scared?

I like rollercoasters after I have ridden them once. I hate hights but I after one ride I love the ride. I am going to Hershey Park soon and I want to ride Farenhiet (U can look up details if u dont know farenhiet) but I am sooooo nervous to....how do people get over that for the first time? I dont want to chicken out so please help!