I've heard it's best to group for Epohh tagging, but I'm curious if you have to do anything special to make that work. Reason I ask is it appears that as soon as you accept the mission, the timer starts running. So does everyone in the team have to accept the mission at the same time? Or just the leader and everyone else is good to go?
The timer only starts when someone in your team tags the first epohh actually. Everyone should get the missions themselves (or share perhaps) and get in position somewhere in the area. Make sure that no one covers someoneelse's area.
It is possible to do the tagging with 2 people but if you want to be on the safe side make sure your team has 3 ppl in it. 5 people is usually overkill. If you have amazing luck an epohh chain should take about 5 days.
Agreed with the above posters. They are correct in what they say. If you think you might need more help, try and do it with just friends, and get used to tagging. Once you've done it a few times, it should be fairly easy.
Feel free to click the link in the picture of my signature, that can help you considerably if you should so choose.