Hello, neither of these jobs are terribly difficult. It takes about a half hour to swap the brake light switch and roughly an hour to change the shifter. I'll post that information below so you can see what's involved.
I would like you to know there where a few recalls regarding brake light switch replacement and re routing a wire harness for it. If the dealer didn't address this you may want to print it off and bring it to their attention. That work should be done at no cost to you.
Brake switch recalls
The brake light switch just unplug, has a jam nut to loosen and screws out. Click here for location infoIf you're having problems with the brake lights not working or the shifter not wanting to come out of park It could very well just be a bad brake light switch or the associated wiring. I would really suggest hitting them hard on that recall.