I did a search but couldn't pinpoint a thread that had this. We are leaving tomorrow afternoon, driving to WDW. There's a possibility that we may try to get there the day before our arrival. We are scheduled to get there on Saturday. If we feel well rested and want to keep driving, we discussed doing so. Will this mess things up at check-in if we decide to do so if I've already done online check-in. I've never done it online before so I don't know the whole process. TIA.