What stage management duties do you consider the most challenging on our job posting?

"(X duty you consider challenging on the job posting) is one I consider challenging as I never had to perform this duty. However, I am positive I will successfully be able to perform this duty due to my (X acquired skills or X experience that will enable you to succeed in this role - such as project management skills acquired while working as a Project Manager). I am sure I can easily transfer these skills acquired in this role to this position."