First, make sure you have all day!!!
When I replaced my ps pressure and return lines, i had the front of the supe on stands, and undid the two bolts securing the rack itself in place. I pulled the rack about an inch and a quarter from the subframe for space to work the lines out. You empty the ps system with the rubber hose on the driver side going into the rack, no need to unbolt the banjo bolt yet. When thats empty, go ahead and unbolt the banjo bolt on the rack, and then the one on the pump itself. It takes some fishing twisting and cursing, but you want to pull the pressure line down, rack side first. Then do the return in the same manner. Go ahead and pull the reservior for simplicity, you may want to replace that thick line too. Now with NEW lines, you replace the return line first in reverse fashion of disassembly, then the pressure line. Don't fasten the rack side of the pressure line until you get the rack fastened back onto the subframe. With the Supe still on jackstands, fill up the reservior with ps fluid. I purchased the half gallon sized (you'll need this much to burp it) prestone ps fluid WITHOUT 'stop leak'. Its harder to burp the system of air as per the TSRM with 'stop leak' additive. Good luck!
-Dave
Edit: tips:
With Toyota parts you get the copper shims that go with the banjo bolts, the shims are connected
so they stay in place for you, where as the autoparts generic copper shims are not joined, so you
should get some thread sealant to make the CLEAN surfaces of the banjo bolt somewhat sticky to
aid in reassembly
That thick hose on the bottom of the ps fluid reservior is rather stiff. To help reassembly along,
lightly coat the inside of the hose with grease, it will save you a dozen expletives!
Break the grip of the banjo bolt threads on the rack before you loosen the rack.
Before you loosen the rack, put blocks under the wheels and drop the Supe to typical ride height
(with the jackstands too of course) so that the rack doesn't drop lower when unbolted
Thats all of my gripes and solutions i can remember...