Well, Fuzati's right. It's rather strange to start subs to get off codeine..but anyway, IMO i think that you can taper the subs, 6mg, then 4mg etc.I don't think that it will be difficult..and the faster the better, but OK, of course not so fast to get in W/Ds...Workouts, jogging and exercises generally, always helps A LOT, while you're detoxing, so your endorphines will find their way to work again, as they used to..
Well, come on, i don't wanna hear bullshits...You have not lost your world, either yourself of course, it's just the fuckin subs that makes you think this way, fuck them...
Stand up strong on your feet, focus well your goal, and think..The fact is that the things are not so difficult, as you're maybe thinking they are..Come on, other people have kicked meds more stronger than codeine, like oxycontin, hydromorphone, even fuckin heroin. Yeah, i know, you're thinking "oh, these people have done it cause they were strong, i'm so weak.."..
Fuck no, you're not weak, maybe the drugs make you feel like this, but IT'S NOT TRUTH...Stand up and fight..You'll win.Keep the faith (Bon Jovi,yeah!

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I wish you all the luck, believe in yourself, i'm sure that you'll make it, cause you fuckin CAN...!!!
MartinFn