Don't be intimidated. 🙂
Most labs teach you "on the job" and the skill set you need you'll have to learn there, so it's likely that unless your classmates worked in an almost identical lab, they'll be starting more or less at the same place you would be, you'd all have to be retrained. They might have a little more familiarity with gels etc, but most likely it's not something that you won't catch up on pretty quick.
I think if you show a lot of enthusiasm, excitement, and really get it across that you're motivated to learn and to help in any way you can, that you're a quick learner and a good team player, you should do fine. I definitely think attitude will go a long way.
If you do have related skills though, DO play them up. For example, I got my last research job largely due to my computer savy and ability to manipulate databases and learn software, which turned out to be a skill in high demand to anyone doing clinical research that involves statistical analysis. So if you're tech savy, or a gifted grant writer, or a whiz at finding anything and everything in lit searches, those are skills that they might be interested in.