How to use uneven sprites?

[regiostech]

Hi guys. I'm a programmer who's interested in game dev, so I'm trying to start with 2D. Spritesheets make sense to me when used programmatically, so I thought I would try to use some from SR. The thing, though, is that all of the sprite sheets in the tutorials I've used have been uniformly spaced, and you knew the sizes of each sprite beforehand.

But with a spritesheet like this one, there are things like a watermark on the sheet, and the different animations are different sizes.

http://www.spriters-resource.com/resourc.../67255.png

I've been Googling a lot, and I'm still confused.

Should I just split it into different sheets, and then try to work out the frame sizes myself? Or is there an easier way? Thanks in advance, really appreciate the hard work you guys do.