Don't expect the Atma grind to be easy, let alone getting the myth necessary to upgrade to Animus and beyond. Until your weapon is upgraded to Animus, its stats are considerably weaker than the equivalent ilvl 100 soldiery weapon. Each book boosts the stats, but only up to the level it should be for its level. Once you get Novus, the disparity widens since you can customize which stats you want.

Personally, I really don't see a point to the grind any more. The ilvl 110 weapons are fit for purpose, giving comparable stats to a moderate Novus weapon, and even the recent upgrade won't entice me to go through that hell again just to upgrade my WHM. To be honest, I'm not even convinced I'll be able to finish Novus in my own lifetime due to the prohibitive costs involved.

Still, that's just my humble opinion and no doubt others will have theirs too.