I purchased my macbook pro in July 2009, and it came installed with Leopard. I received an upgrade disk to snow leopard from Apple from the upgrade program. Since Steve said the best way to do a clean install of Lion is to do a clean install of Snow Leopard... would the best way to do this be to do a clean install of Leopard, then upgrade to Snow Leopard, then download Lion? If so, how do I go about doing this?