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Hi Richard
I would say it's more a test of patience. You can correct any mistake you make , short of breaking the glass! The bit I found hardest with my second mirror was parabolizing and testing. Once a friend took me through that process I was fine with other mirrors I made. Slow mirrors are a good way to go like Mark suggested. My first was a 6 inch f10. I just left it spherical and it worked really well.
Don't expect to save money making your own. Do it only if it interests you as an end in itself.
Rod
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