I've totally been in your shoes. (Well, almost, thank goodness I didn't have to work three jobs. I have no idea how you're doing that. More power to you!)
We always knew that one of us would have to move. Although we both agreed that it made more sense for him to move to the US, since I had a great job and financial security, we decided that for the time-being, I would move to the UK, as DH has two daughters. So I made the definitive decision to move and actually moved within 2 months. Those 2 months were a whirlwind of preparation, but I just made lists of things that needed to get done, and I stuck to it.
You mentioned about your car. That was a nightmare for me. I was only 12 months into a 42-month lease on a new SUV. The time I was preparing to move was around the same time that gas prices hit the roof in the US. I couldn't get anyone to take over the lease. I ended-up paying over $6,000 in early-termination fees.
In the meantime, DH used those 2 months to find us a new place to live, and he did a stellar job.
I used my frequent flyer miles to visit him and sort-out which of my belongings to take/ship to our new home and which to sell, donate, give away, or leave behind. While I was there in the UK, I also gathered up his documents to take back to NY for my fiancé visa.
The visa process was a thousand times easier than I thought it would have been. The people at the NY Consulate were nice and very efficient. I received my visa the same day.
A week later, I moved to the UK towing 8 pieces of luggage (and paying excess baggage fees) in addition to everything I had shipped ahead of time, but having all of my stuff immediately there with me definitely helped the transition. My family, especially my mom, was a huge help with my move. DH's mum was so helpful by keeping in touch with me, and helping me to adjust.
Since I was on a fiancé visa and not permitted to work, I had plenty of time to plan our wedding, which went like a charm. You just need to do your homework to find the best options for you.
Hopefully, I'll be starting work soon, because it's tough (at least in my opinion) for us to live in London on just 1 salary. But since everything else has gone very well for us so far, I have no reason to think that finding a job will be too bad.
DH has been my rock when I've gotten worried about this-or-that in the whole moving and getting acclimated process. His good vibes are definitely rubbing off on me.
My advice to you is to stay informed, be prepared, stay positive, and try to relax.
