It's super easy. You can do it and it will save your time and money. The more time-consuming part probably is to find the exact wiper blades part. I have found two best selling candidates on amazon.
1. Genuine BMW Product https://amzn.to/3Ij5JgP
2. Bosch ICON Wiper Blades 24A20A https://amzn.to/3XtQGoI
Enjoy DYI :-)