Step 1 that often gets forgotten is to go through all your stuff and identify what you no longer use as well as things that are getting unserviceable and you should really replace. The usable stuff you just no longer need should go to some charity like Goodwill Industries. The worn out just goes to recycling or the dumpster. Replace it when you get to the new location. It lightens the load.
If you’re going to hire a mover, prepack and count the number and size of boxes. You can get a much more accurate quote form a mover, and you really don’t want to pay them to crate everything.
Definitely find a job first, and if possible, a place. If you can’t buy or rent in advance, then find a month by month short-term stay place and plan to move there till you can find a permanent spot.
Best of luck on the move. San Francisco isn’t cheap living, but it’s a vibrant, exciting city. You should enjoy it.