Yes, RTFM (Read The Fucking Manual) is kinda the gold standard if you're looking for consistency and preheating is what eliminates most of the difference between shitty ovens and more reliable ones.

The time it takes to go from cold to hot varies massively between ovens, and your oven might not be up to temp by the time your recipe says to pull the stuff out.

Remaining factors are keeping consistent temperature and overshoot, which is why you'll invest in a proper oven if you're even remotely serious about baking.