The third phase in the process of change involves preparation. You have to prepare for change. Impose change without preparation and it can be a shock to the system. It’s kind of like transplanting a seedling from the safety of its plastic pot into unfamiliar garden soil. The pot may have become confining but it is nonetheless familiar. Transplant the seedling under the wrong conditions and it can go into shock and die.
This is why change is something for which you first prepare. Part of that preparation, in tennis, involves finding the right coach. Who would you best click with? Who is the person who can best manage the murky dynamics of being both teacher and employee at the same time? The preparation stage involves doing the right research.