ok, so last saturday went up to the mountains here is socal. chains where not required but they should've been. i did my fair share of sliding around on 1" of ice on the roads. luckily i didn't freak out and never hit anything shockingly. my question is with chains will i pretty much be safe as long as i use common sense when driving on ice and snow and what not? also when you buy chains are they for all 4 wheels or just the rear wheels? i know these are probably very stupid questions to some but i have no real winter driving experience.