How do you replace the Cap nut and Lock nut for the 617?

Do you remove the spring that holds the rocker arm and everything will come loose?

 

Thanks. Are there any other tips, tricks and special procedure before removing 1 rocker arm?

Checked and adjusted valves 2 months ago and found that the lock nut (counternut) intake valve, cyl. 5 was rounded off. Cam and other nuts are great, except for that one lock nut.