I've been looking at the info offered about Spyder and X-rite as well as CiC's tutorial. I haven't checked Ted's PDF link yet but I have a feeling the information will be 'over my head'.
So even if I did invest in something offered by Spyder, doesn't it all come down to a judgement call by what I see on my screen? How would I even know the best choice to make?
I found an app on my system called ColorSync Utility (Adobe product v4.14) that seems fairly detailed about setting choices. But it'd still be up to me about the final settings I'd make and I could make things worse rather than better.
I'm definitely confused about screen calibrations and best ways to deal with it.
Screen image of ColorSync