Best case scenario is that you process your vension, steaks, chops, burger, sausage, etc... immediately then vacuum frezze it. Sometime life does not dictate that, but by making sure all utensils and work surfaces are clean, having the meat frozen, and all the grinder parts taken from the freezer as well, you should not have a problem. I've made sausages from frozen burger given to me by relatives, and I'm still fine. Sanitation is just as important as temperature. Freezing, partially thawing, then re-freezing is alright, just don't do it more than that. And make sure to fully cook the sausages, especially if you've added pork.