Hi @AnnaB, welcome! 🙏
You can find a good tapering guide in the resources (left sidebar):
https://taper.community/resources/blog/cymbalta-tapering-guide
I am personally (and unfortunately!) more familiar with Zoloft, but there are plenty of others in this forum who are on the same path as you.
That said, we all share the same "slow is smooth, and smooth is fast" approach.
(Though, to be fair, "slow is less bumpy" probably nails it better...)
Let us know what you need. We all love to help out if we can.