The phrase "daunting proposition" means that something appears difficult or challenging, making one feel nervous or unsure about how to approach it. Full definition
This is a somewhat daunting proposition when considering Gastronomy seats a few hundred people as opposed to many from - scratch kitchens, which are much smaller in size, Djordjevic notes. (fooddrink-magazine.com)
It was actually a rather daunting proposition at the time... (wexboy.wordpress.com)
If a cascading cake seems too much of a stretch of your baking skills, this might be a less daunting proposition. (idealhome.co.uk)