Originally Posted by
menth
You really don't need university to use photoshop. Especially if you don't want to do anything serious. If you want to make graphic design or anything visual communication related then I suggest getting a book to read to understand everything theory related, because not really everything is on the internet.
First thing to do for you is; get used to the photoshop tools and understand what you can do with each tool. And if its just signatures you want to create I suggest joining gfxresource forum, probably the only one active right now, so you can get proper resources and tutorials to learn. However for me the best way to learn was to experiment.
And its not hard to use, but you need knowledge to create something professionally. Which means you should study the subject yourself, or well... yeah go to a university for proper education.