Well after experiencing echo buff 1st hand i have to say it'll be pretty easy for the trials the allow it now.
My hp from 5174 as a whm soared to 7k+ at 25% buff so....
The tanks got 10k+ and everyone else were at 5kish.
The dps was so strong it was ridiculous and the healing power was like as if i had divine seal on 24/7!!
The only thing the echo buff won't buff is ur knowledge and latency for the fight.
But still, if u use echo you'll be able to catch up fairly quick!