Champions, Minstrel, Lore-Master and Burglar can make a kick ass fellowship. You will have multiple mobs DPS (CHM), Debuffs (LRM + BRG) and Healing + Power (MNS+LRM).

Assign a task to each guardian (you must have two, at least): who is going to tank which monsters and who is going to tank adds.

Make them raid assists and have a third one just in case… assign a role tho him/her too

Define the order in which the mobs will be attacked and explain (or check if its the first time) what they do to see how they act.

Tell hunters to not use AoE (rain of arrows, thorsns, etc) since they may get aggro from other mobs. They will laso break some other skills from other members of the group.

Main assists should focus on th targets, failling to do so will distract other members and confuse them about which target to attack

Do a readycheck to see if everybody is on the game at the moment of attacking.

Minstrels can alternate their buffs (two minstrels or more recommended, same as tanks) in each group and can switch groups to do so.

1 Burglar is recommended to trigger FM and add more to the groups

2 hunters are recommended (or more) to finish things faster. Tanking is the main part of the deal but running out of power or dying because everything is effective but slow will not help.

Lore-Masters (2 recommended, too) to keep some dangerous mobs out of the battle (example: the hilmen ladies that heal). SAme as tanks, should be assigned a task.