I just did mine, in prep for an HPDE at Road Atlanta. I hate to admit it, being a gear head and all, but I've never changed PS fluid in my cars before, and never had a problem. BUT, the chocolate goop that I just flushed (appropriate term!) out of my SVTF was scary! My car has 59k well maintained miles (er, except for the PS fluid!). After 59k street miles (zero racing), the PS fluid was literally, no exaggeration, chocolate syrup.
I am going to run this new Red Line fluid for a while and then flush it again with more Red Line. It only took an hour, and next time prolly 20 minutes, and takes about 2 quarts. Very easy, don't put it off. You can do it all from the reservoir.
If you have a battery charger, hook it up - it will take some of the load off the battery when doing this: Pop the coolant tank out of the way (leave hoses attached), pull the PS reservoir out of the slots (no screws, just rubber grommets) and dump the reservoir fluid in a milk jug. Pull the small return hose and plug the reservoir barb, attach extension hose to the return hose, drop that in the milk jug. Fill the reservoir with new fluid, pull the electrical harness from the ignitor/distributor thingy, and crank the engine for about 5 seconds while turning the wheel. Fill the reservoir and crank again. Repeat the "crank, turn and fill" until the fluid going to the jug is clear and clean - should take a over a quart. On the last crank leave the reservoir barely empty. Put the return hose back on, replace the reservoir, fill it, and replace the coolant tank. Plug the ignitor back in and run the car, turning the wheel. Check the PS fluid level and top it off if ness. DONE!