So, with the help of the same ancient recipe book I made my Christmas cake and a very informative post from FrugalFeeding, I managed it!
For some recipes you may need to blind bake the pie crust (where you bake the crust without a filling, using baking beans or dried rice etc. to hold the pastry down) but for this recipe that's not necessary.
Now we can move on to the actual pumpkin pie recipe- which I will either post later today, or tomorrow :)
Here's part 1- pumpkin puree.