I tried this 3 years ago, but my husband became enraged, he seems to be declining rather quickly now, but still very opinionated - I have tried briefly explaining what we will be doing but that talk leaves his mind in a few minutes, just need a little reassurance as I am getting pretty nervous about this.
I took care of the paperwork early on, when my husband was periodically very paranoid. I warned the lawyer that he would be able to understand an explanation but might not agree to sign. She said that was OK and she'd just come back until she caught him in a more lucid frame of mind. But it worked out fine the first time.
Good luck!
To the 1 st answer thanks it is POA financial & medical that I needed done