@Gidgette this is a great question, a great idea, and one of the many in-store services we are working to reimagine in these unprecedented times. Unfortunately, at this moment, because our stores are still closed, our car rack install employees are not able to perform installations. And, while we absolutely see the upside of your "side gig" idea, for many reasons we are not able to facilitate this type of interaction.
With that said, if you are at all interested in installing your own rack system, there are excellent YouTube videos from our main car rack manufacturers that can be very helpful during an at-home installation. You can also find lots of help from Yakima and Thule.
At REI, we believe a life outdoors is a life well-lived.