Do the 20 level cap ones first.
I am member of a Summoner LS, and no one gets help with avatar primes in that unless they have completed the 20 solo cap ones or you are high level enough (like level 60+) on some other jobs to make oneself helpful in the fight.
____________________________
Amanada (Cerberus-Retired) (aka MaiNoKen/Steven)
-- Thank you for the fun times in Vana'diel
Art for the sake of art itself is an idle sentence.
Art for the sake of truth, for the sake of what is
beautiful and good — that is the creed I seek.
- George Sand
A designer knows he has achieved perfection,
not when there is nothing left to add,
but when there is nothing left to take away.
- Antoine de Saint-Exupéry