I have been reading a lot about how the liquid yeast packs need to be set out a few hours to warm up and then i think you're supposed to activate them and let them sit for a few hours more before pitching? Maybe i have it wrong. Anyways, i'm about to brew my first time tomorrow and i will be using nottingham yeast. I know this needs to be rehydrated so when would i do that? Will it be done a few hours before i pitch it (like should i rehydrate it tonight?) or when?