Mark is right, turn from NAV to GPS, then turn on the AP (autopilot), turn on the APR (approach button), then set alt., speed. your done, enjoy the flight.
I just pulled up to the injured pilot and came to a complete stop, make a save point so you can try a few things. When they ask you if you want to attempt the challenge did you say yes or no?
There is a mission called Hurricane Landing, where you must do a cold start mission and fly and land in a hurricane. I enjoyed it very much. It can be found at http://flightsimulatorxmissions.com/. There is also a download from perfect flight with the Boeing 717-200, it comes with 25 flight plans where you must fly from cold start to fininsh.
I flew the mission and got a success, it took 2 tries to land after departing MaCcall. I have FSX deluxe with SP1. Just to let you know it works with SP1. The only thing was the audio volume was low, hard to hear him talking, I just clicked on captioning and it was fine to read the audio. Great job with the mission, realyy enjoyed it. :(
Kevin has his own website (http://flightsimulatorxmissions.com/). It is all about mission creation. The mission is there for download in both versions ( Accel. and not Accel.). There is also many missions to download.