Any of the degoogle communities are a good start.
!degoogle@lemmy.ml !degoogle@discuss.tchncs.de !deGoogle@lemmy.ca
or
!degoogle@europe.pub

I imagine the following communities can be helpful:
!privacy@lemmy.dbzer0.com
!privacy@programming.dev

But any guide would essentially be:

• Identify what kind of services and products from Google that you use (ex: Android, Google Maps)
• Identify replacements for those services and products (ex: GrapheneOS or LineageOS instead of Android and OrganicMaps, OSMAnd or Magic Earth instead of Google Maps)
• Verify that the replacements work for you
• Make a plan on how to move to the replacements you have identified. (ex: Backup all important data on the phone before changing OS)

@buyeuropean@feddit.org

Unless you want to find alternatives to every single app from google it's not that hard. I was barely using anything from google so the hardest part for me was buying a phone compatible with lineageOS and slowly change my email at the places I was interested to keep my account.

Ez. Ask ChatGPT.

I literally just typed in "How to de-google my life?" and it gave me a 12 step instruction plan from ditching Google for DDG/startpage/searx to data migration.