Pulled oven away from wall, disconnected power and turned off gas. Removed oven door in order to remove lower pan. Also removed grates. Removed heat spreader and screws holding former igniter. At rear of oven, removed screws holding cover, pulled igniter through to disconnect. Returned to front of oven and screwed in new igniter and passed leads through rear of oven. Returned to back and connected new igniter and placed connection outside of oven wall. Replaced rear cover. Returned to front and replaced heat spreader and lower pan. Pushed oven back to wall ensuring gas line not kinked. Reconnected power and pushed over to wall. Put door back on and returned grates. Tested work and all seems in order.