Maybe someone else can advise as I don't have recent experience. Back then Google assisted us through a representative for a month. But it was mostly generic as they dont understand our business deep enough.
Best way is learning through practical experience by starting with small budget, and increasing slowly with refinements.
Good that it worked relatively easy for you, but it is more of an exception than norm.
In my industry, there is a clear want for a better product but that isn't sufficient for them to switch due to natural resistance to change. Hence significant marketing is needed through trusted channels to remove that fear-of-unknown from their minds.
https://workspace.google.com/marketplace/app/hiretale_ats/387251605270
Time to say goodbye to messy spreadsheets and bloated ATS.