If you want to read about how Schwalbe feels about some rims and tires being harder to mount and how you can deal with it then read here:
https://www.schwalbe.com/en/tech
It’s an amazingly detailed document covering the company and it’s products Did you know they make a fluid called “Easy Fit” that can help ? Also they talk about tried and true techniques like holding down a section of the tire with a toe strap or zip tie while working on it Highly recommended.
BTW, that little brochure that we all throw away when unwrapping a tire was where I got that link. Enjoy.