When To Enter A Stock

Here is a question we got:

I wouldn't mind hearing again the strategy on when to enter a stock. For example, say you put out "IBM long over 90" and the futures are up the next morning and we open up and IBM moves over 90 in the first 10 min of trading - do you enter then or typically wait for the open to settle out more? Also, let's say you get into IBM, it shoots up to 91.50, then falls back to 90.25 and seems to be using 90 as support - would you ever recommend selling at 91.50 then re-entering at 90.25 since it's still above the "get in" price? Or is it generally not worth it?

Thanks, J

Well, here is the deal. The first ten minutes of trading is a nightmare to get involved with. That