Hi everyone!
I've never done a road trip before and I'd appreciate your experience and advice!
Welcome to the forum!

Just for comparison, a 450-500 mile driving day is more normal for most people who are just trying to "get somewhere." Driving 800 mile days is a tall order and is not normally recommended by me.

Can it be done? Maybe, barely. If you have two drivers, you've got a better chance. It doesn't leave any time for stopping anywhere though, except for rest/gas breaks. If the weather is bad anywhere along the way, you will likely not make it on your schedule (you may not anyway, unless you can discipline yourself to keep on the road steadily).

Why not keep a couple of extra days in the plan, and then see how it goes (don't pressure yourself, in other words).