I'm neither a teacher nor a professional. Just wanna share my humble thoughts and experience.
Personally I find that no. 3 is easiest amongst the 4 scherzos. Interestingly, it is again no. 3 the easiest amongst the 4 ballades. Having said that, like many other suggested, all eight of them are difficult technically by nature, and yet they are so beautifully written.
I also view that besides technical requirements, it is also important to be able to learn the background of these pieces, what Chopin might have in mind when writing them. In a piece (e.g. scherzo no 2 and ballade no 4), whilst some melodies/sections repeat 3 times, one should know how to play them (slightly) differently. The most difficult one amongst all eight, to me, would be ballade no. 4.
Good luck. If you do want to play them, I think you can do it, provided that you have the passion, patience, endeavor, time, etc. Of course, a lot, a lot more, if you want to play them in concert pianist's standards.