I'm guessing that the reply you've received from ThaddeusFinch might not be the answer to your question that you were hoping for?! If so, then my understanding of what he said (and the reply I was expecting him to give!) is that he scales into a position incrementally over time and likewise for the exits. Whether that's gradually adding to a position that's in profit or 'dollar cost averaging' to one that isn't - I couldn't say.
Back in the noughties, I remember ETX Capital ran a week long competition for a £20k cash prize and I used the latter technique to make stupid profits in one day to win a daily prize of a very nice bottle of Margaux. The problem was that I blew up the account four or five times in the process and had to 'reset' it back to the opening balance and start over. Unfortunately, I've never come across a live account that offers the same facility!
Tim.