A great question, which nobody in the thread as asked as yet... goes to show that you are a veteran trader.
How would I have managed exits?
That is a very tricky question. And the answer in long winding.
Primary reason for investing in stocks is to take benefit of the Long term capital gain taxation policy. Therefore, I will have to hold my stocks for at least a year from date of purchase. Therefore, having purchased in Sept to Dec 2008, there is no question of sale before say Jan 2010.
At which point, I will start looking for stocks that are expensive, as I am now interested in locking in some gains to submit progress report.
Underperformers will be trashed and performers will be held longer.
As an easy first step, stocks whose industry has still not picked up, EPS has not shown any growth, but stock price has sharply increased is seen as expensive (Case in point, BHEL, Hindalco, Tata steel, BoB, SBI etc). I expect these stocks to fall harder when Nifty corrects, and not rise as much.
There are others of Banking, IT, FMCG sectors whose EPS is on the up-and-up and so is stocks price. It is beyond my ability to know whether they are expensive. I do not trust (read: UNDERSTAND) various valuation models. So I will hold them longer.
In step 2: A game of PE-ratio:
I will study quarterlies to monitor company progress, get a strong understanding of the pulse of the company. There will be some stocks whose growth has slowed down, like Infy, then I will be interested in booking profit when its PE gets on the higher side. As I know fully well, that high PEs are not sustainable. Also, HuL, ACC.
And finally, if there is a monster move on the monthly esp after a sustained rally, I will surely sell every stock from my portfolio and lock in the bumper-gains.
Then Rinse-And-Repeat