Mussels have a reputation for being difficult to cook, but this is just not true. In reality, the hardest part is the washing. Place them in cold water (they should close; if they don’t you should throw them away). Scrub any dirt off the surface of the mussels and remove the beard with a small knife.
If you can get this down, you will have no trouble — and they take minutes to cook, so they’re the perfect little starter.