The instructions that come with the replacement valve tell you to remove the toilet and turn it upside down. Fortunately, the toilet I was working on was far enough from the wall and I found that by using a small mirror to help me see, it was not necessary to remove the toilet.
After you remove the 2 screws from the valve, there is nothing else holding the valve in except the O-ring and the linkage on top. You need to take off the cover at the back of the toilet under the seat. The screws are underneath near where the screws were for the valve itself. I think there are 3 or 4 for the cover. Use a small mirror to see where they are.
After you get the cover off the top, make sure you look closely at how the linkage is attached to the valve so you know how to put it back. Take a photo or 2 if you have a digital camera or make a sketch. Then just wiggle the valve with one hand while you pull straight down and it should come out. As it comes loose, work the metal linkage out of the arm on the valve from the top side with your other hand.
2015 DRV Tradition 376KPS
2015 Chevy Duramax 3500HD LTZ Dually
Full-timers...Home is where we park it.
Check out our blog: Living Our Dream