Start on night one with implementing your new bedtime routine, ensuring your child stays wide awake until going into the crib.
Night one can be a tough night as it is the transition night. Do not have any expectations that you will see improvement on night one. You will start to see improvement within 2-3 nights.
And sometimes things get worse before they get better as you are removing props. It is like taking off a bandaid. And this is why I recommend making all the changes on night one. The band aid is taken off quickly and it is not as painful as you thought. You could make one change at a time and take it very slow. But then the process in long, drawn out and way more painful. And parents do not want to wait that long to start seeing progress.
For many parents the anticipation of night one, is much worse than actual completing night one!