If you get the standard ones, they’re no different than any tire to seat. If you get the HTLR versions, it’s an act of congress to get them on the rim. Seating the bead isn’t much harder than any other tire in my experience, but just getting them on is a royal pain in the ass, since they dont really have any shape to them
For as good as their cx tires are, Im really not a fan of anything from challenge for road or gravel. Really wanted to love the gravel kings, as they’re pretty much just a Chicane in 36 (or 38, dont remember?).