Ok, so we've all heard so many different things about joseki. Joseki are like 9p moves, Joseki are bad for beginners. If you can't understand each move in the sequence then you won't proceed and will have a fatal error.
The pros don't always use Joseki. Learn joseki lose 4 stones. Don't memorize. etc etc etc.
So for the average j=Joe what do we do with joseki? I study joseki this way. Pick a point 3,4; 4,4; 5,3 etc and look at a few joseki for it. Try to figure out why each moves is played and the overall effect it has on the board. Then when you are playing a game try attacking someones stones approaching the way they did in a Joseki. Try it out several times and get the hang of it.
This is a great way to learn how to get good at attacking corners. After that the next step is to learn how to defend your corners. Once you understand allot of the joseki for a point you get a good idea of how you can defend the corner and get a good overall advantage from your defending moves.
Here is a really interesting website of my friend's http://www.learngo.co.uk/index.html he has some cool stuff and a good joseki study page.