Difficulty of ARR trials

[zansettsu]

Hi guys. Been playing this game with my gf and we've recently just done the cape Westwind trial. The thing is, the poor guy went down in like one minute because we had a bunch of veteran players helping us. So we've been looking forward to fighting all the cool post ARR summons like Shiva and Ramuh but were wondering, are all the ARR trials gonna be that easy, with a bunch of veteran players stomping through the bosses for us like a minute?
We don't mind easy bosses but we do want some level of challenge. Would it be insane for us to try to duo the ARR trials, with me as a tank and her as a healer (We can probably overlevel a little and can probably snag a couple of pieces of the ironworks armor.)

Thanks in advance for the advice