I guess this is more a combo list of advice, issues, etc from my brew days:
Don't mix up 5.2 and PBW. They kind-of look the same but they are not.
Don't forget to label everything including grains, cleaning solution, and beer bottles.
Don't rely on one propane tank.
Don't forget to check your valves before doing anything.
Don't mix up your hoses when they are connected.
Don't forget to make sure that your screen (or whatever you use in your MT) is in place before you mash in.
Don't forget to crush your grains before you mash in.
Don't tie off you hop bag to the pot and let the string dangle over open flame.
Don't fill your pot or mash tun until you're sure that it's on a stable, sturdy, and flat surface.
Don't brew on days or hours your LHBS are closed (optional but it helps).
Don't brew until you know where everything is and that everything turns on, operates, etc.
Don't forget to check the weather if you brew outside.
Don't forget to check your water spigot if you brew outside in the cold.
Don't brew when you see city workers messing with sewer systems, water pipes, or road construction near your house.
Don't forget to have spare extract and yeast on hand.
Don't mix up 5.2 and PBW. They kind-of look the same but they are not.
Don't forget to label everything including grains, cleaning solution, and beer bottles.
Don't rely on one propane tank.
Don't forget to check your valves before doing anything.
Don't mix up your hoses when they are connected.
Don't forget to make sure that your screen (or whatever you use in your MT) is in place before you mash in.
Don't forget to crush your grains before you mash in.
Don't tie off you hop bag to the pot and let the string dangle over open flame.
Don't fill your pot or mash tun until you're sure that it's on a stable, sturdy, and flat surface.
Don't brew on days or hours your LHBS are closed (optional but it helps).
Don't brew until you know where everything is and that everything turns on, operates, etc.
Don't forget to check the weather if you brew outside.
Don't forget to check your water spigot if you brew outside in the cold.
Don't brew when you see city workers messing with sewer systems, water pipes, or road construction near your house.
Don't forget to have spare extract and yeast on hand.