Not at all complicated! It'll take you less than 30 minutes, and that includes orientation and prying-loose time.

The adjustment box is pretty easy to find. Pop your hood, locate the right edge of the radiator and fan shroud (that's YOUR right as you look into the engine bay), follow it straight down, and look for the top of the cylindrical thingy with the bolts at the corners and the slotted adjustment thingamabob in the middle that looks like picture #2 in the article (sorry to burden everyone with all this technical jargon).

Itsticks out from the engine side, not on the radiator side, at approximately the same height as the bottom edge of the radiator. There are a couple of radiator hoses in your line of sight, but you'll see it.

The directions are easily condensed:
1) remove top half of fan shroud by removing the 2 screws on top and prying off the 2 clips on each side that hold the two halves together
2) loosen the lock nut around the slotted adjustment screw
3) tighten the slotted adjustment screw until it takes up the slack
4) retighten the lock nut
5) test drive
6) repeat as necessary

Good luck! It won't take any time at all!