hey, totally feel for you there- I would say that you have a smaller habit than some, so that should be good for you, and the length of time you have been using isn't that long, so that helps too.
I was hooked on oxycontin, taking 180 pills/month for two years, and a taper worked for me, but the withdrawal was absolute agony for 4 full days.
Don't know if yours will be as bad with smaller habit, but dont expect to be able to work during the worst of it- I would recommend alternating the withdrawal dates for you and your girlfriiend so that the other can take care of responsibilties.
Just FYI - first 100 hours are miserable- no sleep at all - crawling sensations chills - but it is do-able.
good luck, let us know how it goes.