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As in all the trades, different strokes theory comes to mind. Cutting crown moulding can be coped out on the second piece going up, and into the first, on the inside corners. The first image shows a cope cut for a profile inside corner cut, (paint grade). Leaving the face a little longer than the back insures a nice clean fit.
Now this is one way of getting the crown moulding miter cuts looking like a professional installed it. On a scale of easy, this being the easiest application. The most important element is understanding that a wall and ceiling is a 90 degree, the crown moulding of choice is milled to set an exact way on the wall and tight to the ceiling, if you get the outside corner cuts just exact than the diy crown moulding install becomes much easier. But note that all types vary and a jig on your saw will aide in this cutting crown moulding process. A smaller piece of scrap can assist in the narrowing down the right cuts process as well, with a left and right side test piece you will get there faster, then mark on your saw the holding place of your angle and bevel cuts. Contact me if you wish and i will help as much as i can………. 
When the patent came out on the Fein multi master, we all had to have one ASAP, diy home improvement tool of the decade, for sure. For $3oo plus it was worth it’s weight and could do almost too many things to mention on a blog. As a DIY tool that sands, fine cuts, scrapes and plunge cuts anything, it truly did not get any better. But last year the patent ran out and today, Dremel gave us a gift that just keeps on giving.
The Dremel Multi-Max Oscillating Tool offers do-it-yourselfers and pros a versatile and effective multitasking tool. With fast side-to-side motion, the Multi-Max can take on a variety of projects that involve repair, remodeling, or restoration. With minimal dust and a powerful 1.5 amp motor this tool superseeds the other for under $100 @ Home Depot, equaling the best BEN any DIY or pro could ever spend on a tool!!