"The whole strata community owes a huge debt of gratitude to you and the OCN executive. Much appreciated."
Overwhelmingly, the “rule of thumb” should be to seek appropriate advice, and seek it early and then follow that advice.
If you do decide to take an upstairs neighbour to the CTTT on the basis of strata law, you would be well advised to consult a specialist strata lawyer, especially one with a track record in these disputes, to run your case for you. It’s not essential, it may be expensive and you won’t recover costs even if you win but it will probably increase your chances of success.