Bear in mind that the course does not teach you how to be a calibrator. You teach yourself that part. It gives you a good foundation on what makes proper images. Calibrators learn this skill one TV at a time.
Thinking that this is some magic job to riches is a mistake ...
The course and associated travel costs will run you $2500 ... and the equipment will be another $4000 to $20000 depending on what you buy. You can't just sit by the phone and wait for it to ring though ... it won't.
Calibration is easy ... marketing is hard.