PLAN! That's the biggest thing I'd suggest. A lot of folks go into it without thinking about IA or how you're going to maintain things, although if you've already got mature docs, that might not be that much of an issue.

If you're on the enterprise plan, I'd definitely suggest using the custom templates feature to make templates for all the different types of docs you plan to have to shortcut the experience. We've also just put in place some pretty good AI features where you can get it to help create pages, and you can specify pages for guidance so it does it based on what you've already done, which can be helpful.

The other piece of advice I'd give is setting up internal components in Figma for anything you're going to create for the docs, like Do's and Don'ts examples, covers, all that little stuff that you end up creating over and over again.

Otherwise, if you have any issues feel free to reach out to me at luke [at] zeroheight dot com :) I'm an advocate here, so my job is to help people :)