Since the manifestation of Te is basically shorthand for the manifestation of some kinds of executive functiioning skills (planning, forethought, staying mentally organized, articulate communication, self-discipline, strategy, etc), it'd be safe to assume that all dom/aux Te users have strong executive function by nature. No need to learn it or train themselves, as their frontal lobes simply are naturally strong.
Note that while Te ==> Exec. Function, it's not necessarily vice versa. ISFPs can have strong Exec Function as well, as can any type.
But if you have poor executive functioning, then Te as dom/aux is totally out the question.