Start with the final item in mind
Do not combine books just because they can combine. Start with the item that will receive them. A pickaxe book should respect the Fortune or Silk Touch choice. A bow book should respect Mending or Infinity. A sword book should respect the damage enchantment. Book strategy is only useful when it serves a specific final build.
Once the final item is clear, separate required enchantments from optional ones. Required books should get the cleanest route. Optional books can be tested later and dropped if they make the final combine too expensive. This keeps one extra preference from damaging the whole build.
Pair books in balanced groups
Balanced combining is the core habit. Pair similar-value books, then combine those results, instead of feeding every book into one growing book. A balanced tree spreads prior work more evenly and often lowers the final penalty. It also makes the plan easier to inspect because each staged book has a purpose.
The groups should also match the final item. For a sword, damage and Looting may belong together, while durability support sits on another branch. For a pickaxe, the Fortune or Silk Touch choice may be paired away from Efficiency depending on source history. Grouping by purpose makes mistakes easier to catch before the anvil spends levels.
For six books, you might create three pairs, combine two of those pairs, then combine the result with the third pair if the calculator approves. The exact route can change, but the principle stays the same: avoid making one book carry the entire history of the build.
Use clean high-level books when possible
A high-level book from a villager, loot chest, or enchantment table can be much cleaner than the same level made from many small books. That does not mean low-level books are worthless. It means the cost of building them should be included in the plan, not ignored until the final item refuses the combine.
If you have multiple source books, reserve the cleanest ones for the most important item. A messy book can still be useful on a backup tool, a temporary item, or a build with fewer enchantments. Matching source quality to item importance is a quiet but powerful way to save levels.
Check conflicts before combining
Books can contain enchantments that will not work together on the final item. Sometimes that happens because a book came from loot with odd combinations. Sometimes it happens because the player changed plans halfway through. Before staging a book, check whether the final item can actually use the set.
Common conflict decisions include Fortune versus Silk Touch, Mending versus Infinity, Depth Strider versus Frost Walker, and the main sword damage enchantment. If a conflict is unresolved, stop combining and choose the final direction. A book that looks powerful but cannot fit the item is not a shortcut.
Test before the final item combine
The final item combine is usually the step you most want to protect. Before placing the real item in the anvil, enter the staged books and item into the calculator. Compare the lowest XP route with the lower prior work route, then decide which goal matters for this build.
If two routes look similar, prefer the one you can reproduce confidently. A slightly cheaper route is not helpful if it depends on a side order you cannot track in-game.
When the route is safe, follow it exactly. When it is not safe, change the book tree while everything is still reversible. Rebuild a cleaner source book, drop a low-value optional enchantment, or split the goal into two items. The best book strategy is the one that leaves the final item usable, not the one that crams the most text onto a single book.