main thing is, 'show up and have a blast'
sign up in advance. arrive early on race day to get thru tech (this is easy long as ur car passes reg ME inspection). key rallyX tech items are: all loose items out of car, batt held down tight, no/minimal play in ball joints and tie rod ends. helmets as outlined above.
then walk course with others who will talk you through the best lines. ride along with experienced rallyX pilotes, they will get you grinning like ))&^@@ and then it's time to run ur own car.
don't sweat it about 'being the fastest' cuz you won't be. just relax, look waaay down the course and keep car in 2nd gear.
like in autoX, don't look @ cones, look where you want to go. you will be turning car with the brakes as much (or more than) as the steering wheel.
that is all, see yez there!