Can we do worming 101? We got two separate small herds (7 Icelandics and 6 Shetlands) last fall, both up to date on worming and vaccinations. We'd never had critters of any kind on our land. It's been a pretty snowy and cold winter, and my understanding is that the worm life-cycle needs temps above freezing to start, and that I should begin worming and moving the herd to different pastures in the spring. So we will probably still be snow covered for another 6-8 weeks, though it could be as short as 4. When do I start worming? Where do I buy the meds? What do I need? to get started?