I think the easy part is figuring out where you want to go because we all have that “bucket list” that we keep in our heads. What's hard is deciding where to go especially when there are constraints to work with.
Now this particular step doesn't have to follow the previous but this is the part where you go through your go-to spots to research your trips. Everyone has their own style whether it's books, magazines, blogs, social media, and friends & family.
As you're doing your inspiration gathering, the worst that can happen to you is when you go “oh wait, I remember reading about this cool place somewhere but where did I see that again?” Oh I've made that mistake too many times.