This saved my day today...
I decided today that it was about time to add bit of sealant to my tubeless tires-- which one is supposed to do every now and then because the stuff supposedly dries out. But then I remembered that it had been almost a year since I went tubeless and thought it was about time to screw up the courage to take the tires off, clean out old sealant and start fresh. Mostly I wanted to see if I could get the tires to mount all by myself. When I first got the tires, I had to rely on my LBS to mount them because I was unable to get air in fast enough with a floor pump to get the beads to seal. I hoped the now well broken in tires would mount more easily 11 months later.

So I took off the rear tire and right away I realize replacing the sealant was not necessary. The stuff supposedly dries out, but after a year, with occasional top offs, the stuff in my tire was largely pristine.. some minimal goop dried to the inside of the tires but mostly the sealant was liquid and looked as orange as the day it was put in there. Nevertheless, I cleaned the inside of the tire and remounted, but I just could not get air into the tire fast enough using my floor pump to get the tire bead to seal to the rim. But I also didn't want to go back to the LBS

For my next trick, I stuck a tube into the tire and inflated; this gets the tire to inflate and lock to the rim. I then deflate the tire, carefully unseal only one side so I can remove the tube, hoping that the fact that one side of the tire bead is now locked to the rim will allow me to inflate with the floor pump fast enough to get the other side to seal. So I stick the valve stem in and pump...no dice.

Well, when I first got the tires, I had read that getting tubeless tires to seal with a floor pump could be a challenge; not wanting to buy a compressor, I experimented with hacking a compressor with a coke bottle, following the above linked video.

I never actually tried to install a tire using the coke bottle hack, having turned to the LBS instead, but I found I could get about 75psi into the bottle before the cap would blow. So I threw the thing in a drawer so I would have it if I needed it, not actually expecting it to work. Well, work it did.

I pumped about 70psi into the bottle, which was connected to my valve with a kinked plastic tube, unkinked the tube, and, bang, tire inflated enough to partially seal to the rim. I then pumped another 30psi through the bottle into the tire to be sure the bead was fully engaged and then disconnected the bottle, letting the tire deflate. The tire stayed locked to the rim on both sides the way it is supposed to, I added fresh sealant, screwed the valve core in, and inflated. All is well. Thank you coke bottle hack inventor wherever you are.