One very important thing to note is that when comparing two low hands, you always start with the highest card. This burned me the first time I played this game because I thought my A 2 3 4 7 was better than 23456, but I was dead wrong. In that case, they compared my 7 to his 6 and that's a win for the other guy.
Couple small tips-- if you are going for the low hand stay away from A6, as you can never have the nut low with A6. Sure, you are beating someone who has an A7 but chances are you will be no good by the end.
Lastly, one technique you can use is betting big on the river with the nut low. This is costly some times, when your opponent has the same low hand as you, but a better high, in which he wins 75% on the pot. However, say the board is A 4 8 and you have 23. Your opponent has 88. Turn is a 9, and river is a 10, and say that puts 3 suited cards on the board. You can push with your 23 nut low hand and sometimes you can get the other guy to fold his high hand because now 88 doesnt look so good.
Hope this helps.