I'm not a Vet. Tech. However I have worked in two vet offices and managed two pet stores. So I hope this little bit helps:)
First, be prepared to deal with very ill animals. This WILL be heartbreaking.
Second, be prepared to deal with very injured animals, such as hit by car or shot be gun. This will make you want to hurt someone.
Third, be prepared to watch and/or assist in the passing of someones beloved pet. This will also be very heartbreaking. You will see large grown men cry like babies and have to explain to them you did all you could.
Decide if you are wanting to Tech for small or large animals. There is a big difference in the volume of work to be done and the available positions in your area.
Decide on your continueing education after your initial certifications. You may want to continue on as a surgery Tech. These positions pay more and your education is much more extensive. You will continue on to learn about surgical instruments, sterilization, anesthesia, etc, etc..
I hope this has helped, along with everyone else who will offer advice. Good luck and I hope you go far and become very successful in assisting with saving our beloved animals :)
Horses are the guarding angels of the soul.