Being a CNC operator may seem a little too easy but take a look at the requirements from companies and you'll think twice about the difficulty level of being a CNC operator.
Being a CNC operator takes a lot more than just being able to handle long hours of staring at the monitor or creating an input stack for the programs. What it means is that you have to have outstanding programming capabilities and at least basic machining knowledge.
A CNC operator has to be knowledgeable about blueprint reading. This is because, basic design concepts and construction is hinged heavily on blueprints. Furthermore, the components that are being manufactured by companies that have CNC machines are based on blueprints of a whole structure. Therefore, if you do not know how to read blueprints, you won't know what to program the machine to do.
Another thing that a CNC operator has to have is familiarization with machine operations. If the operator does not know which machine tools are for which job, or how fast the machine can work, or what the rate of feed is for the machine, or even the depth of the cut needed for the operation, then you wouldn't be productive and the operation would be a failure.
The most obvious thing that an operator would have to know would be the general operating characteristics of the machine. He/she would have to know what the machine runs on—tape, network data input, or floppy. Furthermore, proper data input procedures have to be observed to lower the error ratio. A faulty data input procedure could cause the entire cycle to collapse therefore lowering the level of efficiency.