I'm also trying to adapt my trading style to one similar to livermoores - i'm trying to cut my losers as fast as possible and hold winning positions while adding to them. The problem i've been having is adding to my winners, and the whole psychological aspect of really only winning on about 40% of my trades - it seems like i need a lot more discipline to make money with this approach (the discipline to not be afraid to get; then get out of the trade if it isn't working; plus the discipline to hold onto the winner and try to add until my target is hit).
I've been getting a nice lead on positions, then when i try to add to the winners i'm adding at the wrong time and getting stopped out for basically a break even trade.
One thing i have noticed thats helped is i'll immediately stop myself out or add to the position within the timeframe of the chart i'm trading on....example: if i find a trade setup using a 60minute chart i'll enter the trade; and immediately (a) stop myself out after 60 minutes if the trade isn't working (the next 60 minute candle bar); (b) or i'll add to the position after 60 minutes if the trade seems to be working. Then, if i get stopped out, i'll make myself wait another two bars before i try to re-enter another trade on the same side of the market...example: if i get a long signal on a 15 minute chart i'll get long; if after the first 15 minutes the trade isnt working i'll stop myself out; then force myself to wait another 30 minutes before i'll try to re-enter the market on the long side....this keeps my losers smaller if it looks like the trade will run straight to my stop loss (i'd rather get out proir to my stop if i know the trade isnt working). It also prevents me from chasing the market after i get stopped out - it limits my impulse trades that i use to have after a losing trade and it prevents me from chasing the market.
As for adding to the positions i always try to add 1/2 the position size - pyramid trading - livermoore also used it....if my max position size is 10 cars; my initial entry may be 5; then i'll add 3; then 2....then liquidate all 10 on my target; or 9 plus a trailing stop on the last car.