I will say that you should think long and hard about whether to announce your intentions to your DH/SO first. My skids are older, and I never did feeding/caretaking, so I didn't announce. Well, the first time I did and I got a lot of grief from SO. Second time, I just did it and it went more smoothly. Been disengaged for quite a while now and its the only way to fly (for me anyways).

^^^Agree^^^ I didn't announce, just did it by stealth. If you announce it can make DHs very defensive.

I don't think you should make a formal announcement.

However, to be healthy and fair, it might be necessary to state your new boundaries as you develop them.

For example: You all have become accustomed to me picking up your clothes after you. I have decided I am no longer willing to do that. From now on, I will only wash clothes that are placed in the clothes hamper.

Or, DH, I need to let you know I will no longer be available for childcare. You will need to make your own arrangements.

But for some things, like not arguing, no announcement necessary. Just leave the room, or absorb yourself in your book, or whatever you do to tune out.