@Drew65 I don't see any active listing on your account. What's up with that? I looked in order to see if you were hosting a room in the home you live in or a separate dwelling.
As far as being nervous, my advice is to just be yourself- none of us is perfect and the more we try to act like something we're not, because we think we need to act one way or another to be a good host, the more nervous we'll feel. Of course you have a responsibility to offer the paying guest a clean, comfortable space and to be attentive to their needs as long as they're not being unreasonable or rude, but think of how you might greet and deal with a non-paying guest, like say a friend of a friend, or a cousin you were meeting for the first time, who you didn't know but had kindly offered a place to stay.
Be kind, make sure they are reminded of your house rules if you have them, like quiet times and no unauthorized guests, let them know that you are there to answer their questions and to make their stay as comfortable as possible, and that they shouldn't be shy about asking for something they need, that it's much better for you as a host to be aware that something is wanting that you can attend to at the time, than to be given a bad review after the fact, simply because the guest didn't mention that they needed more blankets or something during their stay. Humour goes a long way as far as breaking the ice. Also, if you exchange a few messages with the guest prior to their check-in (as opposed to someone just instant booking and arriving at your door, you'll have a better sense of who they are, if they seem fussy and demanding, whether they are laid-back, whether they have a good sense of humour, etc.
Some of your guests may be more nervous than you are. One guest I had early on in my airbnb hosting arrived and said he'd never used airbnb before and said he was feeling a bit nervous, and wanted to know things like if I had a curfew ( I laughed and said "I couldn't care less when you come home, you're a grown-up- have fun in town and just try not to make a racket on your way up the stairs"). He also asked if I wanted him to strip the bed when he left, and stuff like that, which was very responsible and respectful that he even asked. Once he realized I was pretty easy-going, he relaxed, and we ended up having some great conversations and laughs during the 3 days he was here.