It's up to you if its hard or not, if you enjoy editing it's quite easy to learn.
All you need to do is research, what kind of effect do you want to put on the image.
Search and find the keyword of the design, and search a tutorial on the internet.
Here 1st play all the tools, and you will realize what its use, don't try to make hard and difficult design at first because it will discourage you.
once you know the purpose of the tools and learn a lot of basic design, try searching a bit more difficult.
Editing and designing takes a lot of effort and patience, me creating a design takes me 6-8hours for the defficult and lots of detail design.
Here's a tip, Layer is the key for everything. Once you learn how to fully use and take advantage of layering you can do everything you want.
Try searching Vector tutorial
this is one almost use every tools in Photoshop
Good Luck . . .