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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.
So bought the lifeline pump:
http://www.wiggle.co.uk/lifeline-airblast-tubeless-tyre-track-pump-black-one-size/
Trying my hand at setting my pro ones to my dt swiss 1400 dicut rims. but no joy in seating either bead. I read some people don't even put sealant in until the rim is bedded in. Is it possible to push one side of the bead into the rim? put some sealant round the sides of the rim to aid sealing but that hasn't helped.