You will. It's estimating the WHEN that's tricky. Several months ago, I read a bio on Hetty Green, the richest woman on Wall Street. One of her maxims was to keep a stash of ready cash, so as to take advantage of a distress sale when the opportunity arose.
I go by the same philosophy. I bought more equities in the 1st half of '09 than in any other time of my entire 35 yrs. of investing. Was I nervous?, yep!!!!! But the consolidation had begun, and it was worth it.