It's Class 3 if you are on route. Read the Lopez guide. Maybe even take it with you.
From the Church/Donaldson saddle there is some exposure to climb Church, but not bad. I don't remember anything ore than hiking to get to Donaldson from the saddle.
Look at Dan's TR:
I would not recommend following my route to the saddle. On our way across from Church to Donaldson we spotted cairns marking the normal route. We went down that way. It's steep talus, but technically easy. The picture shows the way we went up.