If you guys want to do missions 68.1 or 68.2, I can probably tank/slow them decently with some good healage. One of the 69 missions has snarable mobs that don't summon, so it can be kited (reward is 3 mana regen aug for casters).
Realistically speaking, any other spell missions, we probably won't be able to do with an NT-group unless there are any Time/GoD+ equipped people besides myself who would want to do them. The stuff just hits too hard to make it feasible.
Can you do a mission, like 69.3, without first doing 69.1 and 69.2? or do you have to do them in order?
You can do any mission in any order, but here's the catch - somebody has to have done them in order so they can get the mission. Although you get a flag for it, unfortunately unless YOU personally start a mission, it does not count towards you being able to personally start the next mission in the progression. So basically, you need to have a designated person to start every single mission for you, or luck out and have a group where someone else has managed to start every mission up to the level of progression you want to do. I've had multiple times where everyone in a group had done all the previous missions but no one had started them personally so we ended up disbanding. Absolutely stupid, they deserve a smack for not fixing this yet.