Hi Aidan,
It is very expensive and unless you are using it on a daily basis, not worth the outlay. There are however leaner versions called Photoshop Elements. I am not sure how much manipulation you can do with that software. I remember receiving it free with a Canon Camera I bought once upon a time. I will look into it for you see if there is any freebees out there. There a a lot of free tutorials on the net now. Many of them brilliant. Search Utube, or just type in Photshop Tutorials and you will be amazed how many there are. I have had the program for about six years and know about a fiftieth of it, far too much to take in.....but it does some magic stuff, wouldn't be without it....Humph....