Chionos is probably right that it's easier to do these days without a planned wipe. There's been a lot of gear and merits added since the days when I did mine. However, I'd still suggest getting most of your people on the steps after the first 2 go down. Having people die in the circle sucks if you do have to wipe.
Just know if things are to the point that you can't make it without a wipe and if it goes that direction make sure people die as fast as possible so as to not waste time. But like Chionos said, you have to have some experts working with you to make this happen, especially as far as your kiters go.
Many of the wipes I've seen are the result of people being a little too tentative in the begging and failing to fully unload all they need to on the TT.
and unlocked smn job. 
those things are extreamly hard. 