You tag players during playing. Then when you select tables, you search for known fishes, you get in line with other regs and wait for your chance to pound them. Also high Avg Pot and Plrs/Flop helps. Usually tables than have those stats really high, have also a long waiting list, because people know 'what's happening'
I usually go on tables which play high pots because I hate playing on nitty tables. I also play on tables where Ive had memorable history with any of the players, so ive got extra information on them