We like to rock!!
Yes, the flushing box is very easy- just make sure to clean the connecting tube (unless you bought a new one), and make sure the tube leads to the waste tank before putting everything back together.
Epson likes to instruct on replacing parts the "easiest" way, which often means replacing more parts or taking off more parts than necessary, but in the long run is easier with less chance of issues in the end- which is why they instruct to replace the whole cap pump assembly, and not just the capping station it's self. The capping station can be replaced, but you have to make sure the spring and tubes are connected on the back, and CS is correctly positioned.
I attached a few photos to help, but can't provide any further assistance for replacing this part. YOU can find just the capping station on eBay and other places online if you decide to go this route, though it's good to replace the pump every few years, so may be best to replace the whole assembly.