your first step would be switching from IVing 8-10mg/day to sublingual an 8mg tablet it doesn't matter for the first week or so how you do it, could be 4mg twice daily or 2mg 4x daily its up to you..
Then the taper would be to drop down as low as you can comfortably.
So for example say you were able to drop to 4mg/day. (which you should be able to)
After a week on that drop to 2mg sublingual a day (this is where it might start to get difficult and you might just wanna cold turkey)or continue...
After a week on that just crush up 2mg and snort 1mg/day in 2- .5mg lines one in the late morning(hold off as long as you can) and one before bed (to prevent midnight breakdancing/sheet kicking, you know what i mean)
So now you're on 1mg daily, now you need to move to .5mg/day in one dose (you pick either in the morning or before bed) w/d's might start kicking in now and if they do, go with them, drop the subs and just w/d. Ride it out, get some Immodium, gatorade, ginger ale, hot showers/baths, clonidine if you can get it and any benzos you can try to get klonopin or valium they are longer lasting compared to xanax which will give you releif for a couple hours instead of half the day with the k-pins/valium.. (they help A LOT just don't get hooked on those, only use when desperate and not longer than 3 weeks(which is longer than how long w/ds last they will be most severe the first week and slowly get better the following week and then there are PAWS which is why i said w/d's will last two weeks but use benzos for 3(to help with PAWS)))
IF you were able to get down to .5 mg/day w/o w/d's than continue to .25mg and so on until w/ds do start.
Thats my advice.. hope you do OK