While I’d say that having points into Tactical Mastery will be very nice when stance dancing, I’d also say that you could level and tank all instances without allocating any talent points; I don’t think that’s the core of your issues here.
It would be interesting to know a little about what you are trying and what you are experiencing…
An older post now, but Elite’s dungeon leveling tanking guide that is aimed towards those new to tanking dungeons while leveling in Classic might be a decent read.