I gotten this scissors (a scissors that could only cut paper) for Yvette before she turned two yo last year. She was not able to cut paper using her first scissors till I gotten her another scissors (real scissors) around 27 mths.
Knowing the fact that both scissors I brought for Yvette will be safe for Yvette to pick up to practice the cutting by herself, I actually left those scissors within her reach. From time to time I saw Yvette picking up those scissors trying to cut by herself. The more she practice, the more she gets the hang of it. It’s a skill that takes practice.
Soon at 3oth mths, I know she could cut pretty well and I believe still there is room for improvement. Learning how to grasp and use scissors isn’t easy thus I didn’t really create opportunity to cut with her, or even practice with her, I left this to her.
At 32 mth, I realised she had already mastered how to cut a straight line without help and also she could follow the line to cut too. She could cut diagonally but still couldn’t cut a round shape.
As I mentioned, my style is to let Yvette develop this skill independently, and I know she is almost there. If you are not comfortable with this method, you could read this site for more tips on how you could help your child to learn to cut.