I'm intending to make reservations towards the end of this month or early April at the latest. We scheduled our OW dives in late May before our trip. Going to a quarry in Alabama--worked out well since the water will be warmer (cold vs freezing

) and our class instructor will be back on that trip. His wife is due later this month, so he wouldn't be able to go if our trip was any sooner. In the mean time, our local dive shop has a 15' deep indoor pool, and they let students use that to keep up their skills until the certification dives. We practice the skills when we first get there, then we swim and try to get better at controlling our bouyancy. Working on not looking like a swiming yo-yo :P
Good point on making sure to bring paperwork & everything: daughter forgot to grab her regulator a couple weeks ago and had to use the rental gear. We started a checklist to make sure that doesn't happen again.