As a late comer (not really, technically) im just worrying about finishing the story first. That should be all you need to do to get a fresh start in Heavensward. Anything other than that isnt really necessary and up to what ever you want to do until release.

Im almost done with the story, and while ill gladly join a Coil, WoD, or EX team that I happen to get invited to before the expansion, im not really stressing it. Maybe ill just level a new class...