(ME: a 64 year old retired female computer programmer analyst)
0) Unplug stove and turn off the gas. I took off the oven door, though you can do it without doing that. And of course you would have had to move the stove away from the wall so that you can get to the back to work on it and have access to the plus and gas valve.
1) Unscrewed the bottom cover that is over the gas jets.
2) Unscrewed the bracket that connects the ignitor the oven wall, then unscrewed the ignitor from that.(the screws that held the ignitor on to the bracket were hard to get off and I loosened them with my electric screw driver, but had to use pliers to twist and pull to unscrew them the rest of the way)
3) Went around to the back of the stove and took off the back stove panel that covers the wires and found the correct ignitor wires for the oven. I noted the differences in the disconnected wires so that I would know what went back were.
4) I taped a string to the two loose wires of the old ignitor before I pulled them through, so that I would have something to pull the wires of the new ignitor with.(Oh you might want to use latex or plastic gloves as I got bits of fiberglass or something on my hands and wrist. If you do that just wash them with COLD sudsy water)
5)Went back to the front of the oven carefully pulled out the wires, untapped them from the string, screwed the new ignitor back on to the bracket, taped it's wires to the string.
6) went around to the back, pulled the new wires through, untapped them and connected them to their appropriate wires, and screwed the back cover on to the stove.
7) around to the front of the oven, screwed the bracket to the stove
8) around the back, turned the gas back on. .. plugged in the stove and tested. It worked! then I screwed the cover back on over the oven jets at the bottom of the stove.