Making ice cream is easy. Really. I trust several sources more than others: David Lebovitz, Jeni Bauer, and the Big Gay Ice Cream team, amongst others. David's book The Perfect Scoop is my ice-cream bible. Here is what I've learned from them:
The bowls of plug-and-play electric ice-cream-makers take a day to freeze. I have two for bigger batches and I store them in the freezer.
Speaking of COLD, keep your ice-cream mixes in quart containers in the fridge overnight before mixing so they are cold, too.