The AMCAS fiasco was two years ago. Last year went relatively smoothly.
Transmission begins in July from what I remember, however some schools will wait because they don't want them yet (I remember Northwestern waiting until the end of July). You will get individual transmit dates on your AMCAS webpage. You could go start getting secondaries if you'd like; just start going to medical school websites and finding them. You'll find that some are going to invite you, some haven't posted them yet, and some are ready to receive secondaries without primaries.