Don't worry about the tank stuff. I don't find it nearly as daunting as it seemed at first. Have a decent hose--ours stores in the bumper but the Navion may have a different storage system. We don't use an adapter for the end of the hose, just dump into the pit with the hose itself. Always sewage first--it probably says so on the waste door, then gray water from the sink and shower. I don't fill the black tank with water but do rinse it with an extra toilet full of water before we close the sewer valve. Then after closing the valve I put in the RV tank deodorizer in the closed toilet and then rinse it down into the tank. Then we do the gray and I put calgon in that tank through the kitchen sink drain but not every time. We have had zero issues in more than 5 years with the waste system and don't mind dumping at all. Some people wear disposable gloves but we just wash our hands in the bathroom sink afterwards. That puts a bit more water into the black tank too.
If your tank has built up gunk in it, you can put ice cubes down the toilet--a couple of bags and drive around. That breaks up old solidified stuff they say. I never had to do it so I don't know. I think you put calgon water softener in when you use the ice cubes too.
Good luck learning the ropes. Before long you'll be a pro.