Cindy, yes, you rest inbetween the 6 and the 12, and there's no rest between the two 12s (going from one exercise to the second).

If you find that 8 is too heavy and you wont be able to lift a heavier weight for 6 you should move the weight down for the next workout - this is why keeping track on paper is so helpful. It allows you to plan that workout in advance and record your progress.

If you click on the sticky above (BFL Hot Links!) you'll find a link explaining how a workout should go - how many reps to do, when to rest and how heavy the weights should be relative to hitting failure.

Best,
Nat