In order to restore a playfield properly, you have to remove every single component. It's a daunting task for me still and I've done it many times.
And that's just the start. In order to restore a machine properly, you'll likely need carpentry skills, will have to refinish metal (often re-plating or powdercoating), be able to diagnose and solder many components, do some paint matching in the cabinet and clean many parts in various ways (tumbling, ultrasonic, hand cleaning).
You'll also be searching for some parts that are very hard if not impossible to find.
For those of us that can restore a game, it's a rewarding experience - but just be aware that it requires 40-80 hours of work and $3-5k in parts. If that sounds like fun - go for it! There's lots of great advice and how-to's here on Pinside.
If that doesn't sound like fun - list it for $6k and don't lift a finger. The buyer will happily pick it up at your house.