Basically, you can make your own paper template, and lay it on your cake. Using a pin and prick holes in your fondant/buttercream all around the template. That’s your guide to pipe within. Only if your really good with a piping bag, and have a good eye could you do free style. Also, I have a set of Wilton push in molds….fancy scrolls etc. They leave impressions on your cake to follow. Got them at Michael’s.
I have a decorator I follow here on CD: Nancy’s Fancy Cakes & Catering. She does amazing buttercream piped cakes. I bet if you messaged her, she would most likely have some good tips.
Hope this helps.
Creativity is God's gift to us. Using our creativity is our gift back to God. Clarky's Cakes 😎