No, this isn’t a post about swearing. Though that’s probably not a great idea either.
Congratulations! Preaching the Word of God is a high honor, and one that you should take very seriously. However, guest preaching is more complicated than simply showing up and preaching. I’ve put together a checklist that I use for my own guest preaching engagements, and I’m sharing it here in hopes that it will help you as well.