If you want to go to every planet in KSP, you're going to have to learn a lot; but if you want to just build kerbal deathtraps, then it won't be very hard. That's the great thing about KSP, you can do whatever you like! People make anything and everything: http://forum.kerbalspaceprogram.com/threads/52548-What-are-the-weirdest-things-you-ve-done-in-KSP You can build a submarine, or a ship, or hyperedit a kerbal bowling alley to minimus! You can build the Eiffel tower Or a WW2 bomber with working propeller engines! The motto of KSP is: How hard can rocket science be any way? And the answer is: As hard as you want.