what he mean is
single skill GK in all available slots. rince and repeat X times, using rest tokens to refresh your player. when you are happy remove GK, give him (imho) single exercise with desired attributes.
example :

that is a result of ONE CA drill after 15x6 GK drills. but I'm only low level trainer, should be little better.

but before all, do read on.search this forum it's all out there. identify fast learners, define your goals and collect some greens.and read.