So I've designed a very successful Duna lander (No pics, I'm running out of space), that's capable of easily getting into a 75,000 meter by 79,000 meter orbit around Kerbin, and returning, all I need to do is add a reaction wheel, radial parachutes on the boosters, a ladder, and a docking port so it can reconnect to the main ship, my next test will be to design a Kerbin return capsule, similar to the Orion spacecraft and service module, but before i can do that, I need to learn how to dock, so... Do you guys have any tips? The closest I got was between 300 and 400 meters, with a relative speed of 26 m/s.