There are as many ways of making roses as there are decorators/decorating tutorials!!! YouTube is full of them. As Sandra posted, you will have to try a few methods and see which feels the most comfortable for you. I personally don’t use a ball tool to thin my petals. I’ve used this tutorial https://www.saracinodolci.co.uk/2018/12/19/beautiful-rose/. Simple to follow.
Creativity is God's gift to us. Using our creativity is our gift back to God. Clarky's Cakes 😎