Meaning of "we are poised on the brink of dramatic changes"

What does "we are poised on the brink of dramatic changes" mean?

I thought it means we are calm and composed when it comes to making dramatic changes.

Solution 1:

It means that dramatic changes are about to happen.

Poised: balanced, hanging
Brink: edge

It doesn't say anything about our state of mind or behaviour when facing dramatic changes.

Solution 2:

The phrase poised on is an emphasized way of implying just 'positioned' in a spatial or temporal reference or both. See:

poised
adjective
1 ready, waiting, prepared, standing by, on the brink, in the wings, all set US forces are poised for a massive air, land and sea assault.

In the given context, there's no relevance to the basic meaning of the word poise, i.e., assured; composed. Rather, it is the idiomatic sense as explained above that applies.