Several things that came to mind in reading your question.
1. I worked for a company for five years, and was miserable the whole time. I made great money, and had weekends free. I went on to own my own business, made nothing worked six days a week and loved it for five years. My point being do something you enjoy and learn to live of the income that provides.
2. How much experience do you have in Vet related activities? I would suggest that if you haven't already done things like this that you start volunteering at local animal shelters to clean cages, walk animals, help in anyway you can. My thought here being that a vet tech's job is not just holding new born kittens and playing with puppies. Yes, there are certainly moments in that job that involve lots of fun and joy, but more often you are handling animals that are scared and sick. The owners are not always pleasant or helpful and you see a lot of sad situations. (I worked in a animal hospital for 8 years in various roles so I speak from experience. I also have three vets in my immediate family.) It is a wonderful and rewarding field of work, but it's not all glamorous.
3. It wouldn't hurt before you make this decision to evaluate how many job opportunities in this field are where you currently live or if you are willing to move. It can be a challenging and competitive field so be honest in evaluating your odds of getting and keeping a job in your local job market.
At the end of the day if you really understand the demands and scope if the job, feel that you have a legitimate shot at obtaining employment, and can afford the education then I would say, "Go for it!" I can't stress how glad I am that I changed careers.
Good luck with whatever you decide.