Yes I do work in a vet's office, a smaller one at that. Although it's the biggest in town it's not a big emergency clinic. I am technically not a "technician" I never went to school for it and do not have a degree but I do everything a licenced tech does, lab work, x-rays, administering meds and nursing care along with taking phone calls, prep surgery ect.the only difference is I don't have a piece of paper saying I went through all the schooling. I was taught everything I know through hands on learning, reading many books and asking a TON of questions.
As far was what's required to become a licenced tech I'm not too sure. Although I know quite a lot about the field I do not plan to stick with it and therefore have not gone to become licenced. The best course of action is to get a job doing tech work at a clinic so you gain the experience needed to help you through school, although it's not necessiary. Unfortunatly the number one problem techs face is not being paid enough for the work they do.
I wish you luck though if you do decide to become a tech, it can be a very rewarding job and if it's what you're looking for it's a wonderful job. At one time I wanted to be a licenced tech so I started working at the clinic but after a few years I came to the conclusion that I'm much better suited to being a dog trainer.
If you have any more questions I'll be happy to answer them. Hopefully things will go your way.