Also ALWAYS seat the beads without sealant, this is a failsafe to make sure that you havent made any errors in taping or making valve hole, sealant cant be 'the thing' that holds it together.
Install tyres, seat, deflate, remove valve core, syringe sealant in through the valve, replace valve core and pump up. It means there's never any mess and the whole thing is pain free.
Fuck tubeless
This is my kitchen