What are ESD (Electrostatic Discharge) precautions?
There are special bracelets that to ground you safely. Of course you can use simple wire as well, but better connect it to the ground through 1..2MOhm resistor.

Be careful with your clothеs - use 100% cotton fabrics (or other natural) and not synthetic. Of course, there are special ESD clothеs and shoes, but for hobby work they are superfluous IMHO.

Be more careful in the winter season.

Remember, that even if marked with ESD precautions, most electronics parts and devices are pretty resistant to ESD, because they have internal protection circuits. So, don't be paranoid. :)