If you don't want to deal with tethering you could also get an intervalometer. They have cheap knockoffs on Amazon, most are in the $15 - 30 range. Neewer makes a decent one for real cheap. I wouldn't spend $100+ for the Canon one when I could just tether my camera, but for $15 it's a handy little unit and doubles as a wired shutter trigger which I find handy at times.
