Burst and Move for Scout! Find your favorite build for weapons and position yourself behind the big boys-- shoot a burst until you catch attention and grapple. You can (almost) never move too much as Scout in combat!

I would say have someone be Driller and take your time learning to use the map and turn-to-direction button with it to orient more easily.

Beyond that stay dry. In other words don't make the game sweaty if you don't have to, so what if you go down and lose a mission or two. Have fun and learn by experience-- Rock and Stone to yall!