When first starting out or learning a new strategy, I would suggest respecting your original stop loss. This way you can get a feel for the signals that appear when the trade falls apart. As Mark Douglas recommends during the 20 trade exercise: make it mechanical and limit decision making.
As you gain experience, you will start observing the above indicators that reduce the probability of your trade working out. This is where intuition allows you to get out of a trade early. Remember that you can always re-enter as commissions are cheap. The danger when doing this as a beginner is that it leads to getting chopped up and/or revenge trading.