If you're not too keen on using the terminal and running Linux commands, then I don't know.
There are nice GUI applications for doing a lot of things now in most Linux distros.
I know there are grub editors, but I'm not sure if they're suitable for use with Mint's GRUB.
Mint's GRUB is special because it uses the fancy graphical gfxboot menu background.
Until someone comes along with a better answer, I can tell you the terminal commands to open your /boot/grub/menu.lst file and change the timer manually,
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gksudo gedit /boot/grub/menu.lst
Once it's open all you need to do is scroll down to the timer setting and change the number there from 10 to 3 or whatever you want, save the changes and close the file.