I counted "Begin Now" as "Think it, Do it"

I originally thought that these tactics are similar, but now I'm not sure. "Think it, Do it" is described as as soon as I become aware of something that needs to be done and can be done (without major disruption), then I do it right away, which gives me the impression that it just locks onto any doable task that happens to be around -- as opposed to a task which was chosen consciously according to one's better judgment.

and "Scheduling Aggressively..." as "Strict Scheduling"

Again, not quite. "Strict Scheduling", as described here, means allocating a certain chunk of time to a certain activity exclusively, while my "Scheduling Aggressively" is closer to Tim Ferris' 4-hour Workweek and means "If something can be done in an hour, allocate 45 minutes".