I feel confident if you follow the rules all will be well. Never go alone on a ghost hunt. Take along a partner for safety and peace of mind. Always say a prayer of protection before and after a ghost hunt. Make sure all of your equipment is fully charged and that you have extra batteries available.
Ghosts have the ability to drain fully charged instruments.
Don't walk into an area snapping pictures right off the bat. Give those ghosts that are present some time to get used to you. Be aware of the surroundings for safety sake. For best results, always take a day walk through before doing a nighttime investigation, if possible. In other words, full respect for the living and the dead.