Linux Mint comes as a live CD, which means you can start your computer with the CD inside it, and it will run the system even before it's installed. Because of your hardware specs, it might be very slow.. however, once it's installed on your hard drive, it should run fine.
Linux is said to be hard and complex. However, I find it easier to use than Windows. If I was to recommend an OS to my grandmother, it would be Linux with Gnome, and not Windows... no virus, no registry cleaning, no antispyware, no defragmentation... in fact, you don't need to know much about Linux to be able to enjoy it. Well, she can't see the screen (she's quite old), so that solves the problem
Linux Mint is a good option for novice users, as it comes installed with a lot of things you would have had a hard time installing yourself (mp3 support, reading DVD discs etc..).
PS: Don't be sorry to take anyone's time. You'll meet a lot of people on the forums and on the IRC, not only from the Linux Mint community, but Linux users in general.. you'll see, people are usually very welcoming and eager to help.
In brief, if you're not "used to" windows, you should find Linux Mint quite easy.
Good luck and enjoy your first steps under Linux.