how long have you been addicted? how many mg a day do you use?
I would think regardless that suboxone would be a better choice than methadone.
I'm kind of on suboxone for a morphine addiction, but granted I was first addicted to IV heroin (about a gram a day at the end) for 6 months first then IV morphine and dilaudid (hydromorphone) for 6 months after I moved across the country to a location w/ very little H to "try and get clean," about 400mg/35mg respectively, and like I said I had been actively trying and failing to get clean for 6 months at that time including a stint in rehab and an AMA escape from a detox, maintenance was a last resort.
so I think you should try other methods to get clean first before you jump on maintenance, you may in fact be surprised that are able to get clean by tapering or CTing once you get a couple weeks away from it (though the temptation to use will probably be high in the first couple weeks). if this is a scrip talk to your doctor and tell them you don't want it/any opiates at this point in time, they can help you taper off efficiently. maybe consider rehab as well.
I personally consider maintenance for people who have truly tried as hard as they are capable and failed many times to get clean using all conventional methods at their disposal. and especially if you have been using like 60mg morphine or something a day for a few months then there is probably no reason to go on maintenance unless you are just looking for a legitimate high.
you may really need it though, you haven't posted many details and I'm not in control of your life anyway.
ETA: if you do you on long term maintenance and ever decide you want to use opiates again be aware your tolerance will be at least 2-3x what it was when you started it even when you're off your maintenance drug ...it is hard to get high.