In principle, the more information we have about something the better decision we are likely to make. We are likely to have the most information at the last minute. Deciding more than we really need to at any given moment can cause regrets later.
Practical Tip: Before you start making decisions, think about the order of decisions. What needs to get decided first? What next? What can wait? Break decisions up into pieces if possible, and if there is anything to be gained by waiting to decide a piece (like more people getting more information), wait. Establish a date certain for deciding each piece.
The last minute, although potentially stressful, is often the optimum time for good group decisions. “I love the last minute,” I once heard someone say. “If it weren't for the last minute a lot of stuff wouldn't get done.”