When operating into an airport that you have never been to before is it normal practice to do so with someone in the other seat who has been there before?
In this case, as mentioned above, the crew were familiar with SEA. However, in general the answer is no, with the exception of certain challenging airports around the world. I have in the past flown into airports with crews who have only ever landed there in the simulator. I have to say it did take me by surprise to learn that at the time.