Do you know the specs on your computer. They would help.
Normally I'd say get a live dvd or flash drive. Then you'd have to reset the bios to boot from whichever and then you can try. Only with windows 8, I think you have uefi and secure boot. Some distros (operating systems, like mint, ubuntu, opensuse, and I'm sure there are others) have a key with them so you can do that. Others, and I know zorin is one, cause I have it, does not. You can turn off secure boot and change uefi to legacy, and then change back to boot windows. Also windows has to be ahead of the other distros to boot. I think I would recommend getting an iso file of mint and burning it with maybe imgburn, or something else that will burn an iso, and try that to get the feel of it. Mint and zorin are quite similar, and are both based on ubuntu, tho it has branched a bit since they spun off. As I said earlier Mint will boot off a dvd or flash drive with windows unhurt. If you still want zorin, and I'm right on your computer, then you can download it and buy a key to get on, or go to the effort to change back and forth if you still want to. There are some really good tutorials here, and a lot of help can be had with this stuff. You can download most distros for free to download, but then you need to check the md5sum, or sha whatever to verify it downladed properly. Good luck, enjoy and welcome here.