+1 on Cristopher's!
It's about a twoish hour job if you've been into your heads before. Plan for sixish if you haven't.
Make sure you have all of the parts:
Then take out the intake, engine cover, evap, and air box:
Then on to 7mm deep and short sockets for the COP cover as well as COPs:
Next is 10 deep and short as well as clever use of U's and extensions for the head covers:
The passenger side is the easy one:
Then grab the universal key to open the factory chain:
Then loosen the exhaust cam bolts from front to rear (slowly!):
And set the cam some place soft and clean:
Remove the old tensioner and install the new one with the new bolts. BE CAREFUL OF THE JESUS PART OF THE MASTER LINK!! There was a spare one in my oil pan after the next oil change because it sprang off.

Ace had a Hillman aisle with another link.
The driver's side is a bit tougher and you'll want to open the fuel line to remove the cover.
And you'll see right away where the problem is:
I'm no expert on right, but this ain't right:
The timing of the intake cam should not change. You have two hexes to the cams and make sure that they line back up with a straight edge when you tighten them: