Live Environment

The instructions given below will be the setup step to start installing Fedora on your hard drive.

Booting into the Live USB

After going through and installing the ISO onto your USB stick, it is now time to install Fedora on your system.
Plug in the USB stick to your PC.

Mind you, this step is very convoluted and varies from one motherboard manufacturer to the other. So, googling about this is the best way to find out what your BIOS key is.
Usually its one of the function keys or the Escape key.
You can try spamming those keys a couple of times just as you start up your computer until you get to the BIOS menu.
Under the BIOS menu, look for an option that talks about Boot Options. Under here, select the USB you just installed Fedora on and the boot should continue from there and drop you into a live environment of Fedora.
If you can't find Boot Options then changing the Boot Order is an alternative. Under here, reorder the options to have the USB stick at the top. Now save and quit and it should automatically reboot into a live environment of Fedora. You will be greeted with a boot screen listing some boot options initially, just hit enter on the first option to boot into Live USB mode.
If you have any issues that you come across at this point, don't think twice to open a new issue on this regard. You will be greeted with a boot screen listing some boot options initially, just hit enter on the first option to boot into Live USB mode.

Now that you have the Live Environment running, you can test out the OS partially here.
On the first dialog, click on Not Now to test out the live environment.
Linux, given its versatility, doesn't require you to install the system on your physical hardware in order to test it. So whatever you do on here will not affect what you have already on your system.
But of course, nothing that you do here would be reflected in your physical install as well. So feel free to mess around until you feel comfortable enough.
Make yourself comfortable with the workflow of the system and when you are done, you can proceed with the installation procedure.