Product review (5 stars): Let it Light (easily)!
Had a burner that would not light easily for probably over a year.  Then it seemed to rarely light anymore with a random spark coming out vs every time you hear a click like the other good burners.  I have a KitchenAid countertop range that is probably from about 1998.  So I decided to venture into repairing this myself since I am fairly handy.  I also read the other reviews and saw one video about a similar process being done on You Tube.  To start with, you have to unplug the stovetop, shut off the gas line and disconnect it from the main.  I chose to do it near the top where it connects to the stove top so I wouldn't have any hose in the way.

As mentioned by some others the trickier parts are removing the aluminum cover from the glass to not break it.  I added some 2x4's for leverage, but found you really don't want to use them too heavily.  I used a putty knife to break the seal of the cover to the glass and it still seemed stuck.  You do have to remove the gas regulator as pointed out in the pictures too.  Then it was helpful to have another person grasp the corner of the cover and pull up firmly while you hold the glass downward.  The cover eventually separates from the glass and you can remove it, there are 2 wires connected to watch out for to unplug or as I did, just left the cover close by without removing it.  The next tricker part was putting the new clip onto the shaft of the new igniter in such a tight spot.  But with some patience it finally starts to go on and can easily be slid down.  Then you just clip the wire back onto the end of the igniter.