Tubeless Tyres -"saying the same things about tubeless tyres over and over again" Hippy read the first f**king post

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.

but no joy in seating either bead.

So the air is escaping from somewhere. This is usually around the valve core. Double / triple check the tyre bead is sitting on either side of the valve hole - by default one side tends to sit on top of the hole, and you lose the air, and you can't inflate the tyre.

I've found compressing the tyre with your palm over the valve hole when you inflate helps create a weak seal in this area and it's usually enough to get the tyre to go up. This is after dicking around with a tyre leaver to get the bead in the right place on either side of the valve hole - note in the right place, you can't seat it manually.

I read some people don't even put sealant in until the rim is bedded in.

Through the valve core with a syringe is the least messy way of getting that shit in.

Is it possible to push one side of the bead into the rim?

With an innner tube, yes. mount tyer with tube, inflate tube, deflate tube, pop bead on one side and remove inner tube.

put some sealant round the sides of the rim to aid sealing but that hasn't helped.

Yes this won't help, will just make a mess.