Cutting G5 Case

Hi I just ordered all the parts to finally make my dream PC. It’s going to be housed inside of a G5 case

I ordered the mod kits from TheLaserHive

With that I’ll need to be cutting the aluminum in the back of the case and inside. I am not handy at all (yet) so before I make a mistake I was wondering what tool I should buy to cut through the case. Budget is preferred since I will probably only use it for this and maybe some small household stuff.

Thanks!