Sounds like you're a little bit of everything: excited, nervous, impatient, stressed, happy.
I think you've got a good plan. The mileage might be higher than you'd hoped, but it sounds like you're ready. Glad you found a sleeping bag.

If you're able to update from the road, we'd love to hear from you to know you're safe and having a great time. Don't forget the pictures. I'd love to see the area you're passing through.

Best of luck. Be safe and have FUN!