This is straight from the book, never done them myself, but the practice is much the same for other tree seeds.
Collect the ripe seed cone. Allow to dry until the seeds start to come away. Soak the free seeds in warm water with a little detergent to remove the waterproof coating. Once this has softened clean it all off and dry the seeds with paper towel. Sow the seeds fresh in normal compost and leave in a frame outside over winter OR Sow in damp vermiculite or perlite in a sealed plastic bag and refrigerate (40f. or salad rack of fridge, not freezer) for 2 months before sowing in gentle heat (20c or 68f).