I'm in the same boat as you and have been weaning myself off this drug very slowly for months. Get yourself a pill splitter if you don't already have one and start splitting one of your doses a day for a week or two. I don't believe we can suggest to you anything exact and I am only suggesting what has worked for me and of course, talking to your doctor about a taper plan would be best, but if you don't have a doctor, just start splitting the pills and take it slow.
slow tapper are best and yes contact your doctor you seem to have a pretty good plan
they are very dangerous, do you have a rx for them? or are you buying them? if you have a rx pscript call your doctor and tell him/her you want off these and you want to taper down off he will set up a schedule to get you off.