Not all of them are easy.
In fact, most will be challenging, confronting and often emotional. Well, they wouldn't be character defining if they weren't, which is an interesting link to an actor's life. The choices we make do impact on the characters we play, and there are no more important choices than what you will audition for; what you are prepared to accept.
I made a poor choice some years back when I auditioned for Much Ado About Nothing, insisting that I was only going to accept the lead role. It is a choice I now regret. By being so incredibly narrow minded, I missed on being a part of a great show. Lesson learnt, I now allow myself the freedom to accept a wider range of roles. That said, I do have certain standards that I would not compromise. Things like needless nudity, excessive violence, and so forth.