My method for cheapskates. May not work for everyone.
Stan's 355's, Conti Mountain King Supersonic (thin sidewalls 😳 )
Fit yellow tape.
Fit tyre with tube and inflate.
Unseat one bead and remove tube. Other (far side) bead is still firmly seated.
Fit valve with a bit of tacky glue to help the seal.
Tricky part: re-seat the near side bead by hand. Pull the bead on to the rim nice and hard and it'll stick a bit. Work your way around and you might be able to get most of the second bead seated.
Fit track pump and pump like an absolute bastard to seal the seconds bead till it goes POP into place.
Tyre goes down, add sealant through valve, pump, slosh, seal.