Go on YouTube. I installed it myself and YouTube will take you step by step. Try putting in the brand name too. No special tool needed.

Are you sure you need to remove the valve? I've installed TOTO and COCO bidets and they connect by inserting a T in the existing plumbing.

I have installed two Luxe bidets. Maybe I am missing something but it is much easier to disconnect the end of tubing going in to the tank than at the shut off. BTW if you are installing a Luxe be sure to use the metal T and not the plastic one; I learned the hard way.
Pharmer

That’s fine if got enough sticking out do wall.

I replaced mine with shark bite, very easy and shark bite has release tool. If you have the ability and the equipment PCV glued work great. IMO I don’t like compression style, IMO they tend to seep little causing discoloration and calcium build up. But depend on what you type material working with?

I agree, probably don’t need to remove the push pull valve for what installing? unless it has problem ( leaking, stuck pull/push valve, or just old and brittle).

Did the same thing. If not sure, talk to the guys at Home Depot or Lowes. The video helps also. No need to cut PVC pipe, just unscrew counterclockwise like the video shows you. BTW turn off the water and drain the water into a pan. Really not much water once you turn on the sink. WATCH THE VIDEOS.

If you use the technique myself and others have used, it doesn't matter how much of the CPVC it sticking out of the wall. You're cutting the Accor fitting, not the CPVC. There is absolutely no effect on the CPVC length. I think you're confused in what I recommended.

Yes, you’re right, I was thinking you was cutting the pVC pipe, in my house not too much sticking out of the wall.

Consider getting a plumber
 

My husband is a very good diy plumber. He doesn’t have a license but he has worked at a plumbing company for years as a salesman. He recently installed a kitchen faucet in our home up north so when we needed one in our new villa he went to Home Depot and bought a faucet. When he looked under the sink he was shocked! It was a “push pull plastic stop. This was not normal. He called a plumber and got the scoop. We had to pay the plumber to change every stop in the house.

Do nothing Unless you want to replace the cheap valve which I recommend

Some of the Bidets have a tee connection that is installed at the bottom of the tank, some install the tee at the wall connection.

Those push/pull valves have a couple of rings with teeth that dig in to prevent the water pressure from blowing the valve off. If you just twist and pull the plastic pipe will get chewed up and the next push on valve you put on will have trouble sealing if it uses an oring for a seal. Use a pipe cutter to cut the valve itself (so you don't shorten the pipe) then use tin snips to cut the metal rings with teeth. This way the pipe is untouched and you can use something like a metal valve or tee with a shark bite connection that is removable with a plastic tool.

Pex fitting usually are held on by brass ring that crimped to barbed fitting the requires special tool kit to install them correctly. Push/pull push ons are on CPCV plastic tubing. I have removed several and so far never damaged the CPVC tube.