As they all say, you don't.

Under normal circumstances, you can finish one "upper tome" set (that means, the weekly capped tome set, including getting it all upgraded) before the next tomestone comes along, and *MOST* of a second set.

I got all of my Monk's gear to i240 before Scriptures came along, and I had a mix of i230 and i240 Lore/upgraded Lore gear on my BLM as well.

Right now, I'm crafting (and, for my retainers, SB'ing before I give it to them)complete sets of the HQ i250 gear. My Monk will, after I'm done SB'ing all three sets my monk retainers need, get i260 Scriptures gear. All of my other classes will have i250 HQ gear, which I expect will be suitable for leveling in Stormblood.

For those wondering, I'd saved up several Soul of the Craftsman, and I'm using those as needed. My biggest bottleneck, oddly enough, is not Lore, but instead, GC Seals. Every 4 star material uses 2250 or 3000 GC Seals apiece, and the sheer number of 4 star materials needed for the gear makes that a bigger bottleneck than spending 40 Lore on a 4 star material, and another 40 Lore on thee dissolvents, and another 250 lore on crystals for each weapon.