When your oven thermometer reads 450º, use oven mitts to remove the Dutch oven and set the lid aside.
Lay a piece of parchment paper on your counter, and gently tip your dough onto it, seam-side up.
Put those oven mitts back on, and gently lift your parchment paper from the counter. Transfer dough and parchment paper into your hot Dutch oven. Remember that the Dutch oven is HOT. You might burn your hands or fingers on it if you're not wearing your oven mitts... I might know this from experience. Put the lid back on your Dutch oven.
Place your Dutch oven back into the oven and cook for 25-30 minutes with the lid on.
After 25-30 minutes, remove the lid and continue baking for 5-10 minutes, until the top of your bread has nicely browned. Continue baking longer if your crust hasn't deepened in color. The goal is to achieve a nice golden brown color, so be sure to monitor closely to avoid burning.
Remove Dutch oven from the oven when your crust is a beautiful golden, brown. Use your oven mitts to protect your hands while you pick up the bread via the corners of the parchment paper. Set onto a cutting board or cooling rack for up to 30 minutes.
Slice, admire your handy work, add butter, and serve!