What you need to to first is open up Steam, and then navigate to your library tab once Steam is up and running. craft conflicts that arise from removing mods. It's also a good way to allow yourself to experiment with modding, while always having the ability to play the game unmodded at any time if you choose to, without having to 'unmod' and deal with the save-game and. It's just good sense, if you have the HDD space to support two installations of the game. This does two things: 1) preserves your Steam install from any potential 'mod breakage' if something goes awry, and 2) preserves your mod install from getting broken by and updates to the game via Steam. The biggest recommendation of all, however, is that you MAKE A COPY of your Steam install into a seperate folder BEFORE you mod anything, and then mod the copy. It quite literally takes all of the headaches out of modding the game.
Using the CKAN frontend, you can easily select mods to install, remove, or update, and it will notify you of any other dependencies to make your mods work. Alternatively, the SIMPLEST way to install mods is using CKAN, the Comprehensive Kerbal Archive Network.
