you can also try using Technic launcher. i know how you feel with something going wrong downloading mods, the last time i tried it crashed my entire computor i was lucky enough to get it back up and running. but check out technic. you can download the launcher and free mod packs . i got a pixelmon pack xD i quite enjoy it and it has FML with it. (that way i cant screw up the main computor and get in trouble) but if you prefer installing by hand look for a youtube video on installing mods and such. some are quite helpful in giving a detailed looks at what to do
