Question

precautions to prevent from short circuiting?

Answer 1

1- not to use high voltage appliances altogether
2- putting nice quality wiring system at the time of fixation
3- always keep checking for faults
4- short circuiting happens when the live wire meets the nuetral wire, so always check for insulation damages...

Answer 2

Keep your stitches small and snug throughout your circuit.
Keep power and ground lines far apart from each other.
Use a multimeter's continuity tester to check your circuit for shorts.
Put one probe on power and one probe on ground.
Check your circuit for shorts after finishing each path in your circuit.