A Paterson reel must be dry to work, and the ball bearing needs to be free.
I recommend stainless steel reels and practice. When you get good at it you will feel better.
You can feel or hear when the film crinkles. Then unwind to the core, reposition the starting angle and try again.
Sometimes that crinkle wants to slip at the same point. So a frustrating roll sometimes takes a few attempts to get right.
But most of the time the rolls will go right on without incident.