If you know you’re aware, or paying attention, or knowing, you know the mind.
If you know your feeling is happening, then you know the mind.
If you know your thoughts, it means you know the mind.
If you know you have intention, the intention is the mind.
Then you can watch them happening; just know, just be aware that the process is happening.
You need a lot of practice and experience to understand how to observe your mind.