^^No excuses! The only thing you sort-of need two people for is dropping the engine in, and even then you can do it by yourself (I have). My first engine swap (which involved completely un-dressing the old engine, and doing all service items and re-dressing the new engine) I did over a single weekend with part-time help from one person who had never really worked on a Miata before. We trailered it to his garage on Friday after I finished work and I drove it home home before dinner on Sunday. For my second swap I had the engine ready to pull in 2 hours, pulled in less than 1hr with a friend, and then dropped back in and driving in 4-5 (by myself), excluding long-block work. It can be hard to get motivated without someone else there, I know that feel bro, but none of the work needs two people.
It's going to take a finite amount of work to get it back together and driving, the only thing you're doing by putting it off is reducing the number of warm sunny days you'll have to drive it this year. Pick away at it, don't let it sit without progress for more than a day or two!
As for what I've done... coolant and oil change. I put some okay oil in, and straight water, after putting this engine in. I did that so I wouldn't have to clean up a serious mess if something leaked (and the reroute hose did once). Now that everything is broken in it was time for the good stuff: AMSOIL 5w40!