How do you transfer your teaching credential out of state?

Is is difficult to transfer your teaching credential, say from Arizona to California? How do you do it when you are going to school in Arizona and would like to start your first year of teaching in California?

some states have reciprocal agreements with one another–for example if you have a teaching license in one state it will be honored in another. if CA and AZ do not have that reciprocity, then you will need to fulfill the teaching requirements (tests, classes, etc.) for CA. however, if you are simply in school in CA and do not have certification for AZ yet, then you just need to follow the certification requirements for CA and not worry about AZ.