For the 6700 chain, two notes:
1. as mentioned, it's a directional chain. The non-slotted outer plates that have stamped logos should face outwards.
2. there is a preferable way to join the chain when using a Shimano break-off pin. If you're breaking the chain on the lower section (between the crank and the RD pulleys), then drive out the rear pin, not the front one, of any given pair. Reason: Shimano finds that you'll get the best strength if your replacement pin is through the rear hole.
I agree with JiveTurkey, if the RD handles the slack in small-small, you're good.