There isn't much to lose except a few minutes and a few hundred sparks. I solo'd a lot of those Tier 1 NMs in Zitah on several jobs when I was looking to get back into the game last year, one of which was THF with gear likely worse than what you described above. Use August, Amchuchu or Gessho as tank, Apururu or Yoran as WHM (or Kupipi if you aren't in their unities), Koru-Moru as RDM, Iroha II and Shantotto II as damage dealers. I guarantee you'll find that some of those NMs are not as difficult as you may have been led to believe, including Vidala which you can pop after using a Mirror's Tonic to negate the Petrify he uses to open the fight.