Preheat longer than feels reasonable
Okay so here's the thing. You've got two pizzas built, sauced right, cheese that isn't hiding anything, toppings that don't look like you cleaned out the fridge. All that work, all those lessons, and then people blow it in the last three minutes because their oven wasn't actually ready.
I mean it. This is the one that gets skipped and it's the one that matters most.
What "preheated" actually means
Your oven beeps and says 500 or 550 and you believe it. Don't. That beep means the air in the box hit that temperature. It does not mean your stone or your steel is at that temperature, and the stone or steel is what's doing the actual work on the bottom of your crust.
Stone and steel are dense. They're slow to heat up and slow to cool down, that's the whole reason we use them, but it means the oven air can be ready long before the stone underneath it is. If you slide a pizza onto a stone that's only sort of hot, you get a pale, sad bottom crust and a top that's already burning because the air around it is way ahead of the surface underneath it. That mismatch is, I'd say, the number one reason home pizza turns out disappointing. Not the flour. Not the shape. The cold surface.
What to actually do
Whatever your oven's max temp is, get your stone or steel in there and preheat for at least 45 minutes. An hour is better. I know that sounds like a lot for a Tuesday pizza night. It is a lot. Do it anyway.
Here's my rule and it's a genuine opinion, not a fact I can prove with a thermometer: whatever amount of preheating feels reasonable to you, add fifteen minutes to it. If your gut says 30 minutes is plenty, go 45. If you're already at 45 because you read this lesson, go 60. You will basically never over-preheat a stone in a home oven. The oven caps out around 550 here at our elevation same as anywhere, it's not going to keep climbing on you.
Turn the oven on before you start stretching dough, before you even sauce anything. Preheat is the first move, not the last one.
A word on your oven and your altitude
We're up around 4,600 feet here, and thinner air changes how ovens perform a little, how fast moisture cooks off, how things brown. It's not a huge factor for pizza specifically, way more relevant for bread and cakes, but it's one more reason not to trust the beep. Your oven's idea of "ready" and your stone's actual temperature can be two different conversations, especially at altitude where things don't always behave the way a recipe written at sea level assumes they will.
The overproof story, because it's related
I mentioned a while back that I don't always get timing right, and I want to tell you about the time I really didn't.
It was July, the AC in our house was fighting a losing battle, and I made a batch of dough and left it out on the counter overnight instead of putting it in the fridge like I usually do. I figured overnight, it's fine, dough likes time. Woke up to a bowl of dough that had blown up like a science project, all bubbly and collapsing on itself, and it smelled like beer. Like actual beer. That's the yeast just going wild with no cold temperature to slow it down, eating through all the sugar and producing so much gas and alcohol that the structure gave out.
I bring that up here because preheating and proofing are cousins in my head now. Both of them are about respecting time and temperature instead of eyeballing it and hoping. The dough needed cold and slow. The oven needs hot and patient. Different directions, same lesson: don't sluff either one because it's inconvenient.
Sliding it in
Once your stone's actually ready, don't leave the door open forever loading the pizza. Get your peel, get it moving with a quick shake to make sure nothing's stuck, and slide it in with one confident motion. Hesitating halfway is how you get a fold or a topping slide. And obviously, that stone is somewhere north of 500 degrees. Don't touch it, don't reach past it carelessly, and don't do what I did with mine once and run it under cold water right after using it because you're impatient to clean up. Cracked mine clean through doing that. Loud crack, right there on the counter, and my wife heard it from the other room and just said "what did you do." Let it cool on its own. Hours, not minutes.
Before next time
Figure out how long your oven actually takes to get properly hot with your stone in it, start to finish, and just know that number going forward so you can plan around it instead of guessing every time.