Feathering out joints
I'm remodeling and there are some areas of wall that i took out some drywall but not the whole way as it would have increased my project size dramatically. So i'm tieing in new drywall to existing drywall and the existing drywall is 2 layers one 3/8" and one 1/2". As expected once i put the new pieces in and in some areas they do not line up perfect others line up real well so i will feather the joint out with a wide knife. Should i put a coat of mud on the more shallow piece to even out the joint, let it dry sand it then put tape over the joint or should i put the tape before i build up the shallow piece? Or put tape on both times? Thanks in advance.