The way I play the trend is if I'm making an entry for the first time, I go in small no matter what the price. That way if it keeps going down or up, I make money.
Next, I wait for it to go up/down (depending on trend) to my line at which point I'll short/long more, more than likely, it will bounce off of it, or close to it. Next, if it continues it's trend I buy or short more every 50 pips, maybe 100 depending on how long of a trade I want.
It's kinda hard unless you have a long standing trade, because you could see yourself down a few hundred pips, rather than up a few thousand and give back a few hundred.
That's just what I do and it's worked very well.
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