The sway bars (Ford calls them "stabilizer bars") should be installed with vehicle weight on the wheels. My way of doing it was to drive the front up on some pieces of 4x6 lumber I cut for just that purpose. That loads the suspension and gives enough room to do what's needed. The fronts can be done with the wheels on; the back ones have to come off, and that means jack stands under the axle or suspension.
It's actually very simple, if you have the parts, 15, 18 mm wrenches/sockets, and reasonable figure-it-out skills. Maybe a look at the service manual will make it easier:
Index of /service_man/Chassis/Suspension
There is one not-so-easy bit: the book says "Do not let the studs in the front bar links turn when you tighten the nuts", or some such. To get torque on the nut, you have to use a "crowfoot" adapter so you can get a grip on the little hex of the stud. Even if you have the wrenches, it's not easy.
I think most folks just grab the no-turn stud with a (6mm?) wrench and crank down the nut (18mm?) as much as they can, with a box-end wrench. The nuts have a tendency to loosen, with or without good torque readings, even with LocTite blue on the threads.
A competent mechanic with the right tools and a lift should be able to remove and replace both bars in an hour or hour and a half, tops. It takes me, old and creaky, two and a half or three, and I
have had practice.
whats easiest way to install my gt sway bars? 
