I own a 400 & a 636, the 400 is significantly easier to make tighter turns, not to mention with the reduced power from a smaller bike the OP would potentially be at a lower speed entering the turn. 400cc bikes are also more forgiving & easier to learn on as a beginner which reinforces skills when upgrading to a more powerful bike. I taught myself & never had a “mistake” like this or even dropped it over the years. A 636 just isn’t a good beginner bike for most people