Something that is difficult to do.
This idiom means that something is not easy and requires effort, skill, or patience to accomplish.
No, this-- no it is not a piece of cake at all.
Ne, ovo... ne, to uopšte nije komad torte.
This is not a piece of cake degree.
Ovo nije deo stepena kolača.
This is not a piece of cake.
Ovo nije komad torte.
The IELTS exam is not a piece of cake.
IELTS ispit nije komad torte.
However, being a plus size model is not a piece of cake.
Međutim, biti model plus veličine nije komad torte.