Well, like any language, it's not going to stick within a couple of months. It takes time, dedication and a good memory. It's a little harder since it's not as popular as other languages you may be used to being around. It's a LOT better when you have a tutor/someone to practice with. Learning on your own is an alright way, but you don't have anyone to practice what you've learned.
Learning a new language is a very good idea anyways, with our expanding economies, improving transportation and world-wide events.