No worries, and yes, go earlier. I think the check in opens a half hour before the signing starts. I got there at 11:25 (check in was supposed to begin at 11:30, and the signing started at noon) and they were already checking people in so I scanned my ticket where they gave me the book and a sticky with my name on it, then told me I was in 'group 5' and to come back at 12:30, they also gave me a card that had my group number and timeslot on it. I then went to line up where the signing was happening at 12:30 and they verified and took my time card, after which I only waited for 15 minutes before I got to meet him. My understanding is that the timeslots were about 10 minutes for each group? But could be wrong. I was hella nervous as well but made sure to just tell him that he made me into a Leaf fan, inspired me with his leadership and professionalism and I was grateful for everything he did for the team. He thanked me for the 'kind words' and was very humble.