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I hear you! We've only got two park days (one day MK, one day AK) and I've never been to WDW before

I feel like despite not wanting to wait forever, FoP is a must when I don't know when I'll be going back.
Rope drop without a fastpass worked great twice for me this week. I went on a 9am opening, and on an 8am extra magic hour opening.
On both days they let us in about a half hour early. On the 9am opening I rode FOP and was finished at 9am. On the 8am opening day I finished the FOP ride at 8:10. That was today. As soon as I got off the ride I saw that the line had gotten so long and heard a cast member say that the wait was now three hours. And it was still before the park opened to everyone.
I also had a fast pass at noon and I got right on the ride with no wait. I've ridden it three times so far. It's fantastic, but I wouldn't stand in a line for three hours for any ride. I prefer to get out to the bus stop an hour and a half before park opening. It works like a charm. It was 29 degrees the first morning I tried this approach. It was quite a sight to see everyone bundled up for winter that morning, all braving the cold for a ride on a banshee!
We have a party of 9 for next Thursday. It's EMH 8a-9a - how early should we arrive at Epcot to be able to get FOP and Navi? And which should we do first?