Trade timing on market open

Hi Pat and Owen. I wondered if I could please ask for some guidance on establishing a morning routine. I go through the Key List each day before the market opens and I set alerts up. Very often, in the opening noise, several alerts get triggered as soon as the market opens - some then stay above, some then go back down. I then reset the alerts for any that have gone back below and monitor the others. On the call this week, Pat mentioned that he seldom places trades when the market has just opened. Please could I ask (a) "roughly" what you think enough time is before you would consider placing a trade, and (b) if a stock has either moved above then below, or stayed above the target price on opening - how does that affect your decision making - as I know in the first 30 minutes you will often announce that certain key list items are "off the list". I also had an additional question about the difference between selling a % of your holding versus moving your stop loss to lock in profits - is there a difference? Hope that all makes sense. Thanks a million for your help. Best wishes. Chris