Don't worry. It's easier than you may think. 

At the end of the year, many people will be looking for a way out of Microsoft's shackles. The internet will be full of help.
If you don't have exotic hardware, then you're already in a good position.
And if you can get an extra hard drive (128 gigabytes is enough, even external), then you can install Linux on it without touching your Windows installation. Once you've familiarized yourself a little with Linux, you can start with installing WINE and then Poser. Still without touching Windows. Once Poser is running, you can link your current Windows hard drive or SSD to Linux. It will then appear as a subdirectory on the smaller drive. Linux is specialized in this kind of thing.

For a start you need an USB-Stick with at least 8 Gig. Use Windows to install Mint or Ubuntu on it. This is a so called "Live System". You can have a look at Linux without doing any harm to your Windows.

https://ubuntu.com/tutorials/create-a-usb-stick-on-ubuntu#1-overview

---