A blocked bathroom sink can be a frustrating experience, making it difficult to wash your hands or brush your teeth. The good news is that it's often possible to unblock the sink yourself, using a few simple tools and techniques.

Here are the steps to unblock a bathroom sink:

1. Remove any visible blockages from the sink.
2. Use a plunger to create suction and loosen the blockage.
3. If the plunger doesn't work, try using a drain snake or a bent wire hanger to manually remove the blockage.
4. If the blockage persists, try pouring boiling water down the drain to help break up grease and other stubborn materials.
5. If all else fails, you can use a chemical drain cleaner, following the manufacturer's instructions carefully.

By following these steps, you should be able to unblock your bathroom sink and get back to normal. However, if you're unable to resolve the issue, it's best to call a professional plumber to avoid damaging your pipes or fixtures.