if you fly retractable
Certainly requires discipline, a complete awareness of your configuration, and I train this with great emphasis. You must be deliberate as to your landing gear selection, and not make assumptions. I regularly takeoff and land one of my planes with the wheels either extended or retracted as appropriate to the surface. I am very careful about double checking landing gear position for landing by literally speaking it out loud twice before each landing. Attempting to take off with the landing gear in the wrong position is sort of a self solving problem, and although a spectacle, not really a safety concern. It does come down to training and the extra training requirements for a more complex airplane though...