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Thudpucker,
the most important bit of advice I can give you regardless of what software you use is to SAVE OFTEN if you get to a point in your model SAVE IT then give your model a new name (just a 1, 2, 3 after each one is fine) before to continue. If you stuff up you can always go back and reload the previous model with out too much loss. At the end of your design session just pick 2 or 3 or 4 of what ever stages that you consider import to you and delete the rest. Hope this is of some help, all the best.