I would Never call an electrician for this simple repair. It's not Rocket science. YouTube is your friend, just watch more than one video. When a couple videos say to do it the same way you're good to go.
Like CitrusCountyQuilter said, the is no need for an expensive Multi-meter or a cheep one, a simple $4 circuit tester will give you the information that you need. This is less than a $10 repair. If you can put air in a tire, you can replace a switch. It's more about having the confidence and willingness to try something out of your comfort zone. Good luck and go for it, you can do it and save money.