Sliced them in half.
This was probably the hardest part. If you have a spoon with a sharp edge, that would be best. I spent quite a bit of time doing this. In hindsight, I wouldn't worry so much about getting ALL of the pulp out--once the pumpkin cooks it will come out easily.
I scooped out the pulp and mashed it. Now I have lovely pumpkin puree! I'm using it today to make pumpkin cake. :)
As always, you can follow along on twitter using the hashtag #TryNewAdventures.