i soloed this as a 62 hunter.. (hybrid) the name is Trayton look it up to see my spec (argyos server).. anyway  FOR HUNTERS there is a  cliff that leads to a smaller cliff on the left side of the entrance into the reg. ramps side of  the citadel drop down there, aggro that warlock ( or neophyte) i think thats in the RIGHT tent, pull him to up to where u are... kill him and do the same thing to  the drill master when he walks  to the tent the warlock was at.

you may ALSO want to take out the shattered hand  guy that is the closest to  the initial hill  u are on before u drop down to the smaller one... he does call out for help and i aggroed him as well.  if things get hectic.. just freeze trap heal pet and bandage...

i wouldn't recommend using stings as u may need to trap while the sting is still in effect.

I did this and  soloed it frist try hope this helps.. for hunters...