I find that the biggest thing that has impreoved my HU game is to raise with your trash cards preflop (hopefully ending the hand right there, if not and your played back at either pre or post flop then, its easy enough to let go since it is trash. there is the chance that your hand will hit and it will be beautifully disguised for big payday) and limp with your good hands. He'll get tired of your raises and when you limp, he'll want to put in his own raise. You will need to mix it up a little bit otherwise it will become a little to predictable. You will not believe how good this works. Remember your preflop raise amounts do not have to be large, minimum raising works most of the time, because on any given hand, usually each player is dealt garbage.