Taper plan needed for Paxil please

Hi there.  This board helped me so much last year when I came off of Klonopin.  I found out about it a little too late and suffered through some pretty severe withdrawal symptoms but at least I knew what to expect from reading on this board.  I have a friend who would like to taper off Paxil.  She has been on 20mg for 29 years.  She can take as long as needed.  Any advice is appreciated.  Thank you.