It will be a matter of following the crowd. They will start letting people into the park at some point (8:15 the day we went for rope drop on a 9am opening, the day after Irma). You walk over toward the entrance to Pandora. You'll be held on the walkway by the side of Tiffins, and you'll have to wait with the crowd, then at some point (it was about 8:30 for the 9AM opening the day we were there) the CM will start walking the crowd into Pandora and toward the FOP line entrance. There's no running ahead, or along a different route, you just follow the CM at the front of the group and go directly to the line. When we were there, they funneled the crowd directly into the FP entrance.