This is only my opinion, and I try not to sound like a flyfishing snob, heavens knows we have too many of those, but the GR is a little river, and this style fishing just feels totally out of place here. Shoemakers is reached from a set of gravel roads just past Anatone. The drop from the upper plateau down to the river can really heat up your brakes so take your time. If you have to travel it when its wet, be afraid, be very afraid. Fortunately, this region only gets 10 inches of rain a year.
Shoemakers has a road that runs along the river for several miles.
Bottom line, you won't be alone. This is wilderness camping so plan accordingly. Some people just float from Shoemakers and spend multiple days in the canyon before floating out. Campsites are limited so be kind. Let others have a chance at too.