After quite a few years of using auto focussing, auto exposure with the built in meter and 35mm film, it wasn't quite what could be called a culture shock, but I made some basic errors. Such as, several instances where the exposure wasn't correct, because in my enthusiasm I had forgotten to transfer the meter reading to the camera.
Then the times where the shutter didn't fire because I had forgotten to remove the film back slide. Coping and juggling with reduced depth of field when using longer focal length lenses. Then of course the extra weight of the camera and 3 lenses. I am getting there.......possibly via chiropractor!