Go through the competitors once. If your requirements are not that hard, you can find many cheaper alternatives.
The best way is to do a bit of google research and see youtube videos. Don't hesitate in trying the software which is open source. Open source these days are going very ahead in terms of quality.
I will not name the alternatives but a bit of Google research might land you up directly to the alternatives easily.
Consider watching Youtube videos to see which one of them is easy to operate and then make a choice.
Photoshop is a bit heavy, so you will need a lot of RAM and graphics to operate. If your system is slow or laggy or some older processor then your system might become slow if you use photoshop.
The price of the software is very high. I wish they could have made it a little cheaper. But over all, with price, they deliver the quality. Review collected by and hosted on G2.com.