I didn't have much issue with the process, it seemed like any other. A local business is a friend of mine, they were paying too much for too little from their previous web host/dev so I transferred the domain name to CF and ran their WordPress "business card" type site through a static site generator, placed all the files in GitHub, and pointed CF Pages at the repo. Whenever they want to make changes, they spin up the current state of WordPress in LocalWP, make the changes, I run it through the static site generator and push the files to GitHub. Takes them a few hours of messing around to get their content right and takes me 5-15 minutes to jamstack it to GitHub. Free hosting and cheap/simple DNS.

We offer a zero-markup registrar on self-service platform also - https://blog.cloudflare.com/registrar-for-everyone/

Registering domains is very fast. To transfer a domain Cloudflare insists that you use them for DNS, but I already do that.

For the transfer it’s just like anywhere else. Initiate the transfer, get the code from the other registrar and wait for it to go through.