Vicki, I'm going to be a first time visitor to WDW and had the same dilemma. If you wait until you arrive at your Disney World hotel to purchase the UPH pass, you can have them take off the first and/or last day. The only drawback is that you won't be able to get the advance purchase discount which may not matter anyway if you'll end up saving money on the days where you're arriving late and leaving early. Another option may want to keep in mind (which is what we're doing) is when you arrive in Orlando, you can stay at an inexpensive hotel off property, maybe near the airport if you're flying in, and then get up early the next morning, check in at your Disney hotel and get your passes which double as your room key. If your room isn't ready yet, you can leave your luggage with Bell Services. That way you'll be able to take full advantage of the pass as long as you don't have to leave too early on your last day.