There's a lot less messing around if you just microwave the pumpkin whole. Wash the pumpkin, remove the stem. Slash the pumpkin with a knife several times. Weigh the pumpkin and microwave on high for 6-7 min. per lb. Cook until a sharp knife easily penetrates the skin. Let the pumpkin cool until you can handle it, cut in half, scoop out the seeds, remove the skin and puree or mash. Freeze.
You can also roast the seeds once you have cleaned them.