in my opinion, the best way to remembering hangul is to use it to write some sentences in your native language. or maybe to write your name or your friends' name. bring a cheat sheet everywhere, but don't always look to that cheat sheet.

How many ways are there to memorize symbols? Just look at the symbol, listen to the sound, repeat. Start here: http://www.koreanwikiproject.com/wiki/index.php?title=Learn_hangeul