A lot of patience and practice. It's not that hard once you've got the hang of it. Just be sure to have plenty of height to play with and glide all the way in if you can. Only use the engine in short bursts if you think you might not make the runway, and need a bit of extra height. Flaps are a judgment call, because they may or may not slow you down too much too soon.
Once you touch down, just keep her as straight as you can until she comes to rest. Chances are you'll veer a bit to one side or the other, but at least you'll have made it down in one piece.