You can set it so that you can choose which instance you go into. You can go into a populated one if you want help, or one with few people if you are playing with a team.
I am headed to BC tomorrow, and I only made it to level 8
I am so addicted to this game, that the only thing that made me leave the house, was going to the Jack Singer for the Star Trek: The Music concert.
Have fun in beta guys!
*edit* I just bought a lifetime subscription!! You get to play as a liberated borg!!! OMG!!!