I spent $800 on my first espresso machine. The first shot I pulled tasted like battery acid mixed with dishwater. The second was worse. For the first three weeks, I genuinely considered returning the machine and going back to instant.

I didn’t. Instead, I wasted a lot of coffee and eventually figured out what I was doing wrong. If you’re in that frustrating early phase, here’s what’s probably going wrong — and how to fix it.

You’re using pre-ground coffee

This is the biggest mistake, and it’s the one most beginners don’t realise they’re making. Pre-ground coffee from the supermarket is ground for drip machines and French presses. The grind is too coarse for espresso, and the coffee is almost certainly stale.

Espresso needs finely ground coffee — much finer than you’d expect. And it needs to be fresh. Once coffee is ground, it starts losing flavour within minutes. By the time pre-ground coffee reaches your cup, it’s been degrading for weeks or months.

The fix is simple but expensive: buy a decent grinder. A Breville Smart Grinder Pro runs about $300 AUD and will dramatically improve your espresso. If you’re on a tight budget, a hand grinder like the 1Zpresso JX-Pro ($200 AUD) produces excellent results but requires manual effort.

Yes, the grinder costs as much as (or more than) many espresso machines. That’s because the grinder matters more than the machine. This is the single most important investment you can make.

Your dose is inconsistent

Espresso is precise. Small changes in the amount of coffee you use dramatically affect the result. Most beginners eyeball the dose, sometimes putting in 16 grams, sometimes 20 grams, and wondering why each shot tastes different.

Buy a small kitchen scale that reads to 0.1 grams. Weigh your dose every time. For most home espresso setups, you’re aiming for 18-20 grams of ground coffee in the portafilter.

Scales cost $15 from any kitchenware shop. There’s no excuse for not using one.

You’re not timing your shots

A well-pulled espresso should take roughly 25-35 seconds from the moment you start the pump to the moment you stop it. If it takes 10 seconds, the grind is too coarse or the dose is too low — the water is blasting through without extracting properly. If it takes 50 seconds, the grind is too fine and the coffee will taste bitter and harsh.

Use your phone timer until you develop a feel for it. Adjust your grind size until your shots fall in that 25-35 second window.

You’re using boiling water

Many cheaper espresso machines run too hot, especially in the first few minutes after heating up. Water that’s too hot will over-extract the coffee, pulling out harsh, bitter compounds. The ideal brewing temperature is around 90-96 degrees Celsius.

If your machine doesn’t have PID temperature control, try running a blank shot (no coffee) before your first real shot. This purges any superheated water from the group head and brings the temperature down closer to the ideal range.

Your milk technique needs work

If you’re making lattes or flat whites, the milk is half the drink. Most beginners make one of two mistakes: they either scorch the milk (too hot, too long) or create giant frothy bubbles instead of smooth microfoam.

The goal is glossy, paint-like microfoam — tiny, uniform bubbles that give the milk a velvety texture. Start with the steam wand tip just below the surface to introduce air (you’ll hear a gentle hissing sound), then submerge it deeper to create a spinning vortex that integrates the foam. Stop when the jug feels hot but not burning to the touch — around 60-65 degrees.

This takes practice. A lot of practice. I ruined probably fifty jugs of milk before I got consistent results.

The learning curve is real

Home espresso isn’t easy, and anyone who tells you otherwise is either lying or drinking terrible coffee. It takes weeks of daily practice to develop consistency, and months before you stop thinking about every variable.

But once you get there — once you pull a shot that tastes as good as what your favourite cafe serves — the satisfaction is enormous. And the cost per cup drops to under 50 cents, which adds up fast when you’re drinking two or three coffees a day.

Start with fresh beans, a decent grinder, and a scale. Everything else is refinement.