Advance Directives

Years of pain. Years of searching. Years of planning even. Now, after years of searching,when I have obtained the requirement for my exit I have been advised that they are changing the law here in relation to Advance Directives. There is now some hope that I can have some say in my exit. Could I ask of those of you from different counties and cultures have Advance Directives or Living wills etc worked. I would also advise all to consider this, even when I could see no hope or alleviation of the pain something happened that even slightly lightened my load.