Declare index freeze

Software teams have a ritual for the weeks before a release: feature freeze. After a declared day, nothing new goes in, and all remaining effort goes into making what exists work. The discipline exists because adding things late is how projects break, and because polishing needs a stable thing to polish.

Your index needs the same ritual, and mid-October is the week to schedule it.

Why growth turns against you

The open-book format makes the index feel like the safety net, and early on, building it is genuinely studying: deciding what matters and where it lives is how the map gets into your head. But the economics quietly reverse. Every late addition makes the index bigger, and bigger means slower on the day, when each lookup competes with the clock. Worse, an index that keeps changing never becomes familiar, and familiarity is the entire speed of a lookup: knowing without thinking which tab, which page, which corner.

There is a psychological tell, too. Late-stage index building is the most respectable form of avoidance we know. It feels rigorous, produces a visible artifact, and requires answering zero questions. If you are three weeks out and still expanding your index instead of practising with it, the index has become the place you hide from finding out.

Freeze, then rehearse it

Pick a date, about two weeks out. After it, the structure is fixed: no new sections, no reorganising, no new colour scheme.

What continues is use. Every practice sitting after the freeze is also index rehearsal, and every lookup teaches you the geography a little deeper. When a lookup goes badly in practice, slow, wrong tab, entry not where instinct said, that is real information: fix that one entry. Repair is allowed under a freeze. Construction is not.

A useful test during rehearsals: for the things you look up most, time yourself honestly. If something takes long enough to find that you would hesitate on the day, either its entry needs to move to where your instinct already goes, or, better, it needs to move into your head. The fastest lookup is the one you never make, and the last two weeks are exactly when heavily-used lookups should be graduating into memory.

Freeze the index. Rehearse the index. Trust the index. In that order, and starting from a date on your calendar rather than a feeling of doneness, because the feeling never comes.