Bolts fishing is not really mechanical, but flexible fingers are required.
The bolt should come via bracket hole, where you can wrap a string, or shoelace around it, remove the fishing wire and attach the nut.
Any pliers can damage the thread, what will bite you later.
But check the bracket holes before starting the job - mine had powdercoating run into the holes and the bolt with fish wire would not go.
Suck to find it out when you are under the truck with your hands full.
Torklift tie-downs were still easier to install, than Curt front hitch.
