Of course. But that doesn't consider other passengers looking to book that cabin. It is what it is, until it isn't.
Thank you for the welcome! New to CC =/= to new to cruising.
Yes, if you understand the terms. Only one certificate can be used per booking, unless you know about the double, or even triple options.
Stay informed, and they are an amazing deal.
Definitely do a mock booking and look at available cabins. That's a great indication. Encore is a big ship, and October will eliminate a lot of kids.
You'll love it. Encore is a great ship. The weather? That's a crap shoot....