Get yourself a Chiltons or Haynes shop/repair manual. It'll help out a whole lot if your asking how to do this...
Jack truck up, suspend by the frame using jackstands, wheels off, caliper off(hang it out the way w/o stretching the rubber hose), gently jack up on the lower control arm to hold it still, pop off the tie rod end, pop off the upper ball joint, pop off the lower to remove the spindle w/ rotor still attached, set aside. gently lower the jack to relieve tension from the coil spring...do this slowly. it shouldn't just pop out, but it may, so you might want to get a chain around the spring and the frame so it don't just jump out and kill ya.
to install, get some coil spring compressors and compress the new coils. set the lower side first, then upper, and gently jack up on the lower control arm. there's little notches that the coil is supposed to sit in...you'll see what i'm talking about.
get a shop manual/repair manual.
'01 XLT disguised as a '03 Fx4 Level II
Big. Loud. Slow. Bright.