I queried 5 (five!) agencies about my non-fiction project the last week before Christmas. That's five opportunities for someone to say YES (and five for someone to say NO). I read all their websites and didn't see anything about simultaneous submissions, so I hope that this is okay. Except for one, I addressed the letters to specific agents. I stared at the letters for a long time, hoping that they are good enough. I guess all writers must feel this at some point, hoping that the words that they've put on a page (or screen) are good enough to entice an agent to represent them.
I feel good that it's done. I feel like I can let this manuscript sit and wait and I don't have to worry about it for a while. I feel like I can focus on my fictional works now instead.