I am baking my godson's wedding cakes - he lives in Telluride Co at 8700 feet. I am a proficient baker at sea level, I know I need to adapt my recipes for the altitude. HELP please - I will arrive 3 days in advance and won't have too much time to practice there (and I live at sea level) Is it better to do from scratch or adapt a boxed mix cake? This is one of the most important cakes I've done (and I've been baking 35 years) my godson and his bride deserve a delicious cake!