Making it through the year is actually pretty easy. Even under the worst GM I ever had among the 7 years and 3 stores I've been in, I still made my first year.
Just be aware that who's in charge is going to affect your experience A LOT. Mine went something like this:
1) made sure you got all your PTO, took care of all the animals and I never heard her complain about "losing her bonus" to animal care. everyone got along and would go out for drinks. live and let live.
2) one manager was the same, unfortunately her assistant caused a high turnover beginning the first month of her being there; workplace harassment was rampant and PTO payments and scheduling would disappear. she even called me while i was being sedated for surgery to see if I would work on my PTO...
3) just all around awful, both were like my second encounter to the Nth degree if you can imagine it any worse. I'd get chased around and coerced to quit because my second job in healthcare meant I couldn't close and that didn't meet her liking even though I was still bringing in the most commission of my department and doing all my duties faithfully