You should indeed forget about learning Japanese quickly. Learning a new language might not be that difficult, but it will always be time consuming.
The same goes for the Japanese writing system: It's easy to memorize characters, but there are three sets of them: Hiragana, Katakana and a sub set of 6355 Chinese characters (out of 40000+, and 1945 chars are for general use). You would thus have to learn over 2000 chars, and although this is easy enough, it will take a lot of time to memorize them properly.