Some good tips, especially this one:
Secret #3: Detail your trim first
This tip comes from Jim Dvorak, a product specialist at Mothers Polish. He suggests using a trim protectant/restorer like Mothers' Back to Black before waxing your paint. Wash and dry your vehicle, then apply the trim protectant.
The product will repel polish and wax that might otherwise stain your trim. Some pro detailers use masking tape to protect the trim during waxing -- this application can help save time and cleanup.