Just done the front wheel on the Renegade.
Couldn't have been easier! Remove tube, fit tubeless valve, pump up to seat tyre, remove valve core, squirt in gunk, replace core then pump up again.
American Classic Argent wheels with Clement X'Plor USB tyres.
OK, so my Joe Blow Sport couldn't get enough air in to make a good seal, noe could my el-cheapo Tesco track pump, so I splashed out on a new SKS pump, yesterday, shoved a metric shitload of air in there (110PSI to be precise, the max the tyre will take) then shook the wheel whilst rotating it. A small bubble of sealant appeared at the rim, I carried on shaking and it didn't get any bigger, so lef tit overnight and the pressure has held!
So, important things I have found (which echoes other's findings)
1) ensure tape is good
2) once tyre back on, roll it along the floor (no air in) to get the bead seated properly
3) ensure you have a GOOD track pump, or air line.
4) pump the tyre up to it's max to seat fully
5) let the air out, add gunk, replace valve core then pump it back up to max.
6) shake it!
7) shake it some more.
Don't try to bypass any of the above steps, it'll just lead to the tyre going down!
FWIW the tyres I am using are NOT tubelss ones, but there are many reports of them being fine, out there on the internet, hence I wasn't worried about using them.