For me the trick was to stop thinking about it and to just let go. Our built-in parabolic trajectory prediction is magical, just need to throw the balls consistently enough for that prediction to become automatic.
I just fuck around with three balls and it is mostly to help me keep sanity if I am working somewhere with shit CI that takes forever. I was aware that there was a proper pedagogy and nomenclature, but never bothered to learn it. Really surprised to see my "repertoire" is all of the Level 2 and some Level 3 listed on this site.