Buying stock because it's cheap = fail
but if you mean buying indiscriminately then yes you are most likely to get into trouble, warren buffet finished three business related degrees before he started investing in the stockmarket 
If the dow punches below 7800 tonight or early next week I think we are going to see another significant move downwards... alternatively if you see the markets bounce we might be seeing a platform forming for a recovery - personaly though I think the downside hasn't finished yet 