Boy, I really am going to town with these multi-layered lettering techniques, huh?
They're so easy to do too! All you gotta do is:
1- Make a selection of your characters in scene, set aside.
2 - Create a folder for the lettering, and letter as normal.
3 - Use the character selection to mask the lettering folder. It could be working in reverse, so invert the mask if it is.
4 - Bake the lettered page in a pre-heated software for a minute or so while it renders.
5 - Post the finished image to your website of choice. Post while hot.