The signage at Disney is really great. I've never had any trouble following along with the signs, and I can get lost in my own neighborhood.
I will add a note about going from POR to MK by car. (Of course, check all of this before doing it, as my memory has its bad moments!) It appears, if you look at a map, that the fastest way is to leave POR, take a right onto Bonnet Creek Road, a left onto Vista Blvd, and then turn onto World Drive shortly after you pass the entrance to FW. However, it doesn't work, as you'd actually be behind the MK toll plaza and past the turn off for the parking lot at the TTC. Also, it is a bit tricky to turn around there, as World Drive separates and the road away from the TTC takes you a long way before you can turn and head back on the other side of the road.
Best thing to do, if memory serves, is to take a left out of the resort onto Bonnet Creek Road (even though you'll be headed away from MK), take a right onto Disney Vacation Club Way (near OKW), take another quick right onto Epcot Drive, and then a right onto World Drive when you see that. You'll be very close to the toll plaza for the TTC - and on the correct side to go through to the parking lot.
Probably more info than you wanted, but, after many years of my Dad insisting the first way would work from FW, I can practically picture it in my head. Of course, if someone knows a back door way to the parking lot, that might be better!