Drowsy but awake?

This might sound dumb but can someone actually confirm/explain to me how to do drowsy but awake? We never did it with my first, always fully rocked her to sleep and placed her down. We also had a snoo for these earlier months so that actually rocked her too, so she never had the drowsy but awake situation.

I feel a bit confused/lost. My little guy is 13 weeks and I want to start drowsy but awake but is it literally supporting him until he’s basically asleep then just popping him in the bassinet? Then just wait for him to fall asleep? I’ve tried this a few times and he just wakes and stays awake for ages until he cries.. not sure what to do then? Just sit there forever shooshing and patting? Then slowly remove these? HELP!

Also, we use a dummy as a prop. Do I need to remove this to successfully do drowsy but awake? He does tend to annoyingly spit it out.

Thanks!