Not as difficult as you first think
Admittedly my experience is limited to *one afternoon and the weather patterns were set to "fine" but the 737 is actually quite easy to fly and land. It's certainly a lot easier in a real flight trainer than it is on console or PC.
*A friend of my father-in-law built flight simulators for training pilots. Many years ago I was invited to "test" a new 737 simulator at Gatwick airport prior to shipping to Seattle. Within 2 hours I was able to land the plane quite safely with fairly limited instruction (by which I mean instruction that could be given over the radio if necessary). That said I'm fairly certain my "passengers" would be a ball of flames had the weather been set to JFK in midwinter. Interestingly even back then the capability existed for programming the plane to take off and land on autopilot, it's just people for some reason trust having a human doing the take-off and landing more than a computer.