If you're not familiar with this type repair (hence, the question), it's probably best to let a pro do the job. You could end up creating braking problems that will REQUIRE a pro to correct.
If you MUST do it, go to UTUBE. There you will find videos on how to do it. Just type in "'96 corolla master cylinder replacement"
http://www.youtube.com/watch?v=trotr...ext=1&index=51