Don't assume:
"It's probably just a garden snake."
And don't assume:
"Venomous snakes always look aggressive."
Snakes don't have to display obvious aggression to be dangerous.
If you cannot confidently identify the species, maintain your distance and contact a local wildlife professional, animal-control service, or other appropriate authority.
The exact organization available will depend on where you live.
What If the Snake Disappears?
This is where many people make another mistake.
You see a snake disappear behind a cabinet or under furniture and immediately start moving everything around to find it.
Don't.
If you can't see where the snake went, don't put your hands into dark spaces.
Don't reach underneath furniture.
Don't stick your fingers into holes.
Don't blindly move boxes.
A snake hiding somewhere is not an invitation to start searching with your hands.
If possible, isolate the area and seek professional assistance.
Don't Use Your Hands to Search Dark Spaces
This rule applies whether you see a snake or not.
Snakes can hide in surprisingly small spaces.
A dark gap under a cabinet may look empty while still providing shelter.
If you need to move something, use appropriate caution and avoid placing your hands where you cannot see.
This is especially important in garages, sheds, crawl spaces, and storage areas where snakes may be present.
What About Children?
Children should be moved away from the area immediately.
Don't encourage them to watch the snake from close range.
Don't allow them to attempt to identify it themselves.
And don't assume that a child understands how quickly a snake can move.
A simple rule works well:
If there's a snake, step away and tell an adult.
Children can be curious, and curiosity can override caution.
What About Dogs and Cats?
Pets are often at greater risk because they may actively approach the snake.
A dog may bark at it.
A cat may try to pounce.
A curious pet may attempt to sniff or bite it.
Keep pets inside another room if possible.
If a pet has been bitten, seek veterinary care immediately.
Don't wait for obvious symptoms if a venomous snake is possible.
And don't attempt to treat a suspected venomous bite at home unless specifically instructed by a veterinarian or veterinary poison-control professional.
What You Should Never Do
When people panic, they may try improvised solutions.
Some of these can be dangerous.
Avoid:
Hitting the Snake
This can provoke defensive behavior and may also injure the animal unnecessarily.
Trying to Grab It
Never use your hands.
Using a Knife or Other Weapon
This creates unnecessary risk for you and anyone nearby.
Pouring Chemicals on It
Household chemicals are not a safe or humane solution.
Trying to Trap It With Your Body
Don't block the snake's movement with your feet or legs.
Chasing It
Chasing increases stress for both you and the animal.
Attempting Viral "Snake Removal" Tricks
Online videos aren't a substitute for professional wildlife handling.
What If the Snake Is in Your Bedroom?
This can be especially frightening.
If you see a snake in your bedroom, don't immediately jump onto the floor and run toward it.
Instead, create distance.
If you can safely leave the room, do so.
Keep other people and pets away.
Close the door if possible without getting near the snake.
Then contact an appropriate wildlife or animal-control professional.
Before going back into the room, don't assume the snake has left simply because you can't see it.

What If It's in the Bathroom?
Bathrooms can sometimes attract animals because of moisture and plumbing access.