You may be referring to the neutral start back up (NSBU) switch. This one works in conjunction with the neutral safety switch. The NSBU mounts in the valve body of the transmission. Replacing the neutral safety switch might not be such a hassle. If that's what you need to replace, you may want to try consulting your repair manual. I think you may be able to replace it yourself. The NSBU is used by the computer to confirm the transmission is in Neutral or Park to engage the starter motor. If the NSBU has failed, you may want to try providing power directly to the starter to fire up the engine. Then drive to the shop to replace the switch.