As those of a certain era know, the book "Handling the Big Jets" by D.P. Davies, chief test pilot of the UK Air registration Board ARB, is probably the best of it's kind. In my previous life as a airline pilot I followed the advice of the author when he wrote:
"Finally do not become lazy in your professional lives. The autopilot is a great comfort, so are the flight director and approach coupler. But do not get into the position where you need these devices to complete the flight. Keep in practice in hand-flying the aeroplane at altitude and in making purely visual approaches. .....As we get older we all become slightly more lazy, slightly more tired - and this is a bit of a trap. The demand of jet transport flying can best be met by enthusiasm. Personal enthusiasm for the job is beyond value because it is a built-in productive force, and those who have it do not have to be pushed into practice and the search for knowledge. Enthusiasm thus generates its own protection. This is the frame of mind which needs to be developed for the best execution of the airline pilot's task."
I give a framed copy of that advice to each of my simulator students when they graduate.