Ok, the NE5D isn't the newest one. But I think, right now many newcomers buy such an instrument quite cheaply in used condition. The concept, operation and settings of "Set List", "Song" and "Program" etc isn't also entirely intuitive for the very first moment.
At least these shorts, reduced to the essentials, helped me really a lot:
https://www.youtube.com/channel/UCeGDbd ... ghW-By2VPQ
(edit: that's not my YT channel)