We were fortunate to get in on the ground floor on the PTS and got our core raiding team copied over. If that hadn't happened we wouldn't be anywhere near where we are today - which is 3/4 Hard Mode Explosive Conflict. We rocked out the first two bosses last night and finished off the third boss today. We spent probably 20-40 hours learning the fights on the PTS to make that kind of progress, but it was well worth it. According to what we can measure at the moment we're world 2nd (8man) on our progression - it's a cool feeling.
If you're having trouble with anything, or are just wanting to get started on EC don't be afraid to drop me a comment, message, or ping me in game if you're on TJJT.