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The Norton 4-8k combo is an excellent stone to have and enter the world of honing with. You will want something to keep it flat and fresh like a 325 DMT 8" continous surface plate.
The slurry stone...

What Sham said 100%.
Generaly as soon as you feel shave is not as good as it was. Don't wait too long after that because you force the blade, it will deteriorate faster and it will need more than...