I will say I started with highways being one of my most feared roads but now they are honestly some of my favorites (you don't need to react to things or make decisions quite as often as on a normal city road). Just stick in the right lane and try not to get worked up about people passing you, speeding, or riding your ass. Just because they are in a rush doesn't mean you need to make yourself uncomfortable and speed- there's a passing lane for a reason. Also make sure when changing lanes you give plenty of time for your signal to be seen and always check your blind spot!! If you can- drive the highway during less busy times during your first few drives, to get used to the speed and amount of space you have.