it is very easy to replace an ignitor in a gass grill. but before you do that, try to look at the ignitor in the dark (with the gas having not been turned on for a good while, and the supply line removed from the tank.
) to see if it is producing a little spark. if it is sparking, the problem is usually a bad gas/air mix, often due to spider webs and other clogs in the venturi tubes (the gas "spigots" that go to the burners), or if one of the tubes has shifted. if there's no spark, then you can remove and either clean or replace the ignitor. the are usually held in by some kind of retaing clip or nut, sometimes within another removeable assembly. the ignitor will look like a small whitish tube with a wire coming out one end, and a small metal tip on the other end, where the spark jumps from. using a small file, contact burnish, or sand paper, clean the small tip and re-install to check for a spark. if it's dead, buy the replacement kit. try to get one specifically for your grill. the "universal" kits don't always fit that well. hope this helps...
btw, i gotta agree with the 'bug and choc. buy a kettle grill and a bag of lump hardwood charcoal (not briquettes). the difference in flavor is really worth the bit of extra effort (and you get to play with fire).