Make sure you roll the tire with sealent in it so it spreads evenly through the rim, it will act as lubricant for the bead. Also then pumping make sure you put the valve on the bottom, all of the sealant will be there and it will stop air from escaping which will pop the bead on right away.
TL is tricky but once you get it down it’s easy, even mounting it was hard initially but once I figured it out it’s not bad.