I used TGM for my last trip and it was overwhelming at first, but you will get the hang of it. I'm still deciding on my next trip and once I have decided on dates I plan to sign up for another subscription.
Make sure to ask questions on his board over there! Everyone there is so helpful and I believe there is a thread for people who are lost or need help navigating. I also found it helpful to print out articles that I thought were important and I put them in a 3 ring binder organized by parks, general tips, dining, hotel, etc. I spent a lot of time over the summer reading the articles while relaxing on my deck.
dismom9761-I believe the subscroption lasts for 60 days after your trip.