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Does the inner tube trick work well?
Probably, though I've never needed to use one. There's a reason they're called Tubeless Easy, it really is quite simple once you get your head around it. Just remember, once you have the tyre on the rim (as you seem to have), do the soapy water thing around the sides of it. This lubricates it a little, and aids it slipping into position once you inflate it.
Have you got the tyre completely onto the rim? If so, it's only critical to get the beads around the valve to fit correctly, the rest of the bead will pop into place as the air goes in (I use a regular track pump to do mine, such is the tight fit). Don't put sealant in until you pumped the tyre up for the first time, or else you'll be introducing your face to the sealant when it pops into position.
FWIW, I heat up my tyres in hot water before mounting them first time, makes them so much more manageable.