Memorize the most important first. I make sure I know the positive indices because that is when the big bets are out. I learn the indices like phone numbers. Hit/stand 12 has a series of indices for the upcards 2 to 6. I also learned them by dealer upcard. Once you see the dealer upcard you have an idea of what possible indices you might have to call up before your hand is complete. After practicing enough the matchup index will come up without the series. I found this works great for how my brain works. I am not good at memorizing things.

If you use HILO Norm has a great visual tool for some hand matchups. Unfortunately he never completed all the matchups. Look at the vertical scale as it changes from graph to graph for hand matchups:

http://www.card-counting.com/cvcxonlineviewer3.htm