PLEASE!!!!!!!HELP! and quick!!!!

Tommrow is the day! im going to cedar point. im a little bit nervous abot the big roller coasters. i want to go on the maverick mellinum force mantis and the dragster. i just need advise to help me get on them! i dont want to chicken out and ruin everyone's good time. i like roller coasters but ive never been on a big one. i just kinda get a little scared i need help please: [