That's how i have been doing.I don't plan to go to 0,but just a decrease.I started at 24mg,and dropped to 18mg,then 12mg,and those bigger drops were pretty rough,so once i got settled in at 12mg,i decided to go down 1mg at a time.When i get low on my adv and get ready to make a new 120ml bottle,i make it 1mg less than the last one,and so far it has worked really well,my most recent bottle that i use now is 10mg,and i didn't feel any difference at all.Once i get to 6mg,i will be happy and stay there.
On a side note,i had to use my son as a guinea pig first haha.I did his drops after every 30ml though,but he started at 10mg and is now at 4mg,and has no idea that i dropped him like that,so nothing has changed for him as far as he knows.