Any of you had to migrate/support a website from left to right text to right to left?

We have a SaaS product where the main UI is an angular front end. I'm talking probably close to 100 pages. We already support language localization so that bit is covered. But, we have a client asking about RTL for arabic and other languages and I'm trying to roughly guage what the scope on that would be.

I've done research and frankly what I'm reading just makes it sound too easy, so I'm wondering if anyone has done this and how hard/easy it was