Still a bit of a mystery, never done it myself

. This is what I can gether so far:
Firstly you need someone who can take alot of heat, i.e. Bio Sheild / TMS toon etc... etc.. BUT must also be able to land a DOT on your selected target.
Ring of Putrescent Flesh, something I picked up in IS, seems to land on anything. Its a Chemical DOT. Nano Fingers also work well.
The next bit Im a little fuzzy on, so if anyone wants to comment please do.
Once the DOT has landed, from what I can gather you die.
When you re-zone out of the Garden the mob warps to you.
Another neat trick is CH'ing without aggro'. If your near a 100%/75% border, have your doc' stand in 100% whilst you fight the mob in 75%. That way your doc' can CH without the risk of aggro.