Stainless steel braided lines will help in braking, but on a truck it won't make a huge difference because of the high center of gravity. You probably will feel a little more secure feeling when you press the pedal because the rubber isn't stretching. They do have rubber brake line inside the steel braiding (its just there to keep the rubber from stretching)
As for installing... I had to get bigger lines when I installed my lift, and on my '79 they were kinda hard to get off because of age... but on a newer truck it shouldn't be that hard. I have to recommend you get "tube" wrenches if you don't already. They are specialty wrenches that will grab the brake line fittings on all 6 sides so there is less chance of stripping them out. Becareful with them as the fittings are brass and really soft. After you loosen the lines you'll install the new steel ones and then tighten it all back up, fill your master cylander and then need to bleed the brakes out.
Russel makes good ones (had them on the Z-28 I used to own), but I bought the ones Skyjacker makes (cause I got the whole Skyjacker kit and just went with them). No complaints and I can feel a little more sure feel in the pedal now. Call or visit National Tire & Wheel's website to see the prices.
-Chris