The way your H feels because you know sh!t and he doesn't is entirely his problem and not yours at all. So you can either go ahead with the finance stuff on your own, include him and get snipped at, or let him do it on his own, or some combination of the above. You need to figure out what would make YOU feel best among the available REALISTIC options. The option where he behaves like a grownup is not realistic, so don't waste your time on that one.
