The only disadvantage you could have is if you refused to do the research on this here wonderful site full of boxing info. Lots of guides and a wiki to boot. There's even premade macros for you to use as you learn. Check out all the guides you can, and skim through the forum back pages for useful topics with tons of posts.

Your pc should be able to handle boxing. You can always use trial accounts to test it's capabilities. 2 boxing shouldn't give you any problems whatsoever, and if it does then it's just a few tweaks with your settings that will need to be done.