Where exactly are you staying and does your resort/hotel offer transportation to WDW? If your hotel offers transportation I always recommend that to avoid the hassles of the MK parking lot. However, if you do decide to drive in, allow yourself at least one hour prior to the time that you intend to enter the park gates, in addition to your driving time you have to factor in waiting in traffic at the parking toll booth, waiting for parking trams, and then the trip from TTC (monorail is the fastest method) all the way to the MK entrance.