I totally understand where you're coming from. When I got my Sonicare 4100, I initially struggled with the manual too. But after watching a quick video on the Philips website, I felt much more confident. The video gave me a clear visual of how to use the different modes and features. After that, I referred to the manual for more detailed information. It was the perfect combination for me. You can check out the manuals here:
https://manuals.online/sonicare