What are the conditions and steps necessary to engage autopilot during landing? What are the failure conditions, and the steps necessary during a malfunction when autopilot is engaged?

On a clear day with perfect conditions ground control can probably get you on the ground and you walk away safely. The plane may not be safe to fly again, but you walk away. When there is bad weather (common) or other mechanical issues you need a lot more training, and of course if you want the plane to survive to fly again you want some more training.

The only hard part is contacting ground control in the first place. Radio frequencies change all the time.