Fuel Injector Flush

I took my car into the dealer to get the wheels changed out and they recommended getting an injector flush. I'm not sure if it's them just trying to get me to throw more cash at them or if it's a necessity. My car has about 38k on the odo.

Do you guys have any recommendation on DIY kits?
Is it a somewhat self explanatory process?

I have some basic maintenance knowledge but this would be a new one for me.