2. Have one extra of everything in reserve such as linens, pillows, towels, etc. since accidents do happen.
3. Listen to the subtle cues about things that guests could use to be more comfortable. Some of them will have value.
4. Practice your "welcome" speech so you sound like you and not like a stern librarian.
5. Practice saying "no" without ever using the word no.
6. Know where you are willing to bend and be flexible, and where your are not.
And it does get easier as you gain experience and confidence. A host with an infant from a lower cost area of the country is a hard way to start.