Dialling in your first espresso

Start from a ratio

Weigh the dose in and the shot out. A 1:2 ratio — 18 g in, 36 g out — is a starting point, not a target. Everything else is adjusted against it.

Change one thing

Grind finer to slow the shot, coarser to speed it up. Do not also change the dose in the same attempt, or you will not know which change did what.

Symptom	Likely cause	Change
Sour, thin, fast	Under-extracted	Grind finer
Bitter, dry finish	Over-extracted	Grind coarser
Wildly inconsistent	Distribution	Level before tamping

Write it down

Dose, yield, time, grind setting. Three mornings of notes will tell you more than any chart, because it is your beans, your water and your machine.

When to stop

When it tastes good twice in a row. Precision past that point is a hobby, which is fine — just know that is what you are doing.