I also think that its nearly impossible, i cant do it with a Upgraded Cobra also, there are exceptions, it usually depends (at least for me) on some things. Are you alone? When some Bounty hunter Npcs are also attacking the ship it makes thing alot easier, the Anaconda will still take you as main target for some reason but other ships tend to distract it. What weapons does it have? Elites i have encountered always had beam lasers, that stuff hits you from nearly any angle except when you are extremly close behind the engines, and its also hard to stay there, mostly you wont stay there 100% of the time, and its also more or less dangerous because of the Crashing damage you could get. Also depending on the rank the ships have thougher Shields and Hulls, so its takes far longer to beat the ship.
In my case Expert Anacondas are currently my limit when im completly alone (im using 4x Gimballed Multicannons A grade Shields, Generator, Hull, the Ammunition Charged Shield refresher - dont know the correct name in english here, im geared out in terms of defence), so i'd say you need really good skills, Equipment, and a load of luck and even then i think you will die most of the time. Thats just my experience, maybe someone else knows better Tactics/Weapons to do this