I haven't tried to return from eve or tylo. Other than that I have managed to figure most things out. Part count has scared me way from trying a return mission from eve, but I'm thinking of trying it. SSTO took a little learning, with flame-outs and when to start up the jets. I made a VTO plane to get my kerbals back to base from water landings. That was a hard plane to design. It landed in the water with parachutes. Then had vertical engines to get it back out of the water then another would kick on for forward thrust. That was how we use to have to recover people from back in the day.