Hello, Seeking some help?
Before I explain personally, check out
this page on the wiki for loads of info there. (As of which I recently updated).
Starting with your first question, yes you can print off those quests right now, but who's to say those quests will be still around by fall? You'd be better printing off those quests 1-2 weeks before and
fill in the answers at home. Now you're supposed to do the quests in park, but I'm assuming you're getting the quest answers from the spoilers? Good. Fill them out before you get there. (Quest answers is only more baggage for your trip).
Skipping your middle question, this is a good place to say that we usually fill in the answers at the back of VMK Central. Just infront of the big TV. Probably not the best place to aviod staff, so it would probably be a better to sit down on a bench outside on Main Street. However, I would not call filling out the answers cheating. You've still paid to get into the park right?! Just as the people at Animal Kingdom ask: "Did you get these answers from the internet?" Just say "No I came in another day to do them".
Yes, they do limit how many times you can answer the quests. Every 90 days. You will be asked for your park entrance ticket, and they will scan it. (Yes this is also on the
wiki) This is to let the staffers know that if you come back again later, the ticket will not let you get your quest. It's a clever system, but I'm sure someone out there has found a cheat for it.
Hope I helped, pretty long post for me. Have fun, and happy questing!