I had never seen the @Scarecrow tutorial, that was really well done.
Unless you are trying a challenge, Duna is easiest when you have a separate lander and transport and use orbital rendezvous. The ships Spaceport uses are highly efficient and low cost.
I have always approached Duna as a place where I wanted to go repeatedly. So I sent a station with a lot of surplus fuel, a lander, and a 4k deltav ferry to go back and forth between Duna and Kerbin. I would refuel the ferry in Kerbin orbit. Eventually. I would mine fuel on Ike and shuttle to the station around Duna to fuel the lander.
