Believe me as someone who has read technical manuals hoping desperately for help that is meaningful work!
You might want to talk to the folks who are vet techs at clinics near you. I know there are professional journals that can help and of course training classes.
Its not all fun work and you do have to deal with sadness along the way. Not all owners are good ones and not all animals survive etc.
There are a variety of levels of vet tech skills and you can do work ranging from cage cleaning to lab testing within a small clinic.
It requires physical as well as emotional abilities.
You may find these sites useful reading
http://joe.english.purdue.edu/fa05/420S1/node/168
and
http://www.vettechrelief.com/levels.htm
Hope this helps you!
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