I've done it at least five times. I believe twice for a slow flow code, and other times just to keep the small tube clean. It's super easy. My gasket was always sealed to the valve, and I never replaced it yet. Others got a new gasket at NAPA for like $3, so have one on hand. A uni-joint will help with the bolts.

The process is the first question here-
http://www.isuzufaq.com/

If you have no trouble code to start with, you should have after running the engine with the valve off. Just clear it with a code reader.

I tried the breather thing for a short while years ago. I plugged the tube to the intake with a bolt and had a breather filter thing on the hole. It didn't reduce oil use for me at all, so I went back to the stock PCV valve.

It should not pass inspection with a breather like that, but it would be easy to change back just to pass.

Mark