You have the right idea with the template, take it one step further and prenail and glue both inside and outside corners on the ground.. you'll use less caulking and the seams won't open on a year.. just a tip from a carpenter for 35 years.. Your welcome..
Many subscribers give me lots of questions about how to install crown molding trims. Here are some little tricks which can help you in your projects. If you are professional and do this job in another way, please share your experience and we can improve our skills :)