1.) DON'T FREAK OUT!!
As much as many of us think we know how we'd react if we saw a genuine apparition, we don't really know until it happens to us. Perhaps you like to think you would be brave, but you might just freak out. And that is not unusual. It's our instinctive fight-or-flight response in the face of the unknown kicking in. We have seen experienced ghost hunters scream and run out of a room at the slightest noise or movement.
Whether you are on a ghost hunt seeking spirits or you spontaneously encounter an apparition (how it usually happens), fight the urge to panic and flee. After all, this might be a once in a lifetime experience. Not many people have this privilege. Although your heart might be pounding and your mind racing, try to remain calm and still. Ghosts, for the most part, are completely harmless.
2.) TRY TO COMMUNICATE
Yes, you might be able to communicate with the spirit, if this is an intelligent haunting. If this is a residual haunting - a kind of recording on the environment - then you probably will not be able to communicate with it. The ghost will not even notice you. That would be like trying to communicate with a video recording; no interaction is possible. If this is an intelligent haunting, however, a true spirit of a once living person, you might be able to get a reaction. The spirit might look at you, possible as intrigued by you as you are of it. Calmly talk to the spirit, just as if you are talking to a person you just met. Introduce yourself. Ask it's name. Be calm and respectful. There is no guarantee that you will get a response, audible or otherwise, but it's worth a try.
3.) TAKE PICTURES
If you have a camera in hand, by all means try to discreetly photograph the spirit. Even if it's just your cell phone camera, get some shots. But use the best camera you have available. Do not use the flash. The flash might wash out the figure of the spirit or cause unwanted reflections and glare. Without the flash, this will mean that you will have to hold the camera as perfectly still as you can as you snap the picture, especially ihn low-light situation, to avoid blurring. Yes, your hands might be shaking , but do your very best. Take as many shots as you can while the apparition is visible. Also take some shots after the ghost disappears, for comparison purposes. If you have a video recorder, that's even better. Getting movement and sound would be great evidence!
4.) RECORD SOME AUDIO
If you don't have video, at least try to get some audio. If you have a voice recorder, turn it on. Many cell phones also have a recording function or app that you can switch on. There are two reasons for doing this:
*You want to document your attempted communication with the spirit.
*You might at least get an EVP (electric voice phenomena) from it. Even though you might not hear anything at the time of the recording, you might hear something on the recording when you review it.
5.) CALL OTHERS IN
If you are alone but there are others nearby, in an adjacent room perhaps, calmly call them in. This will help confirm what you are experiencing. More witnesses to an event this extraordinary are better than one.
Again, be calm. Don't shout, and prepare them for what they will (hopefully) see. You don't want them freaking out and getting hysterical. Keep them all calm and respectful. Having more people as personal witnesses will also mean that they can additionally document the experience with their cameras and recorders. The more documentation, the better!
6.) WAIT IT OUT
Simply see what happens. The spirit might be visible for just a few seconds, or, if you're lucky, for a minute or more. Do not leave while the apparition is still visible - not even to fetch someone else. Watch it. Take note of what it does and how it reacts. Even if it disappears, wait around for a little while. Perhaps it will return.
7.) DOCUMENT IT
We cannot stress enough the importance of documenting this remarkable experience. Even if you have taken pictures, captured video and recorded audio, you should also make a written account. It will be important and interesting to see how your personal experience differs from the recorded evidence.
It has been noted that ghost phenomena - whether they are residual or intelligent hauntings - tend to recur. So return to the spot where you encountered the ghost. Try to make it at the same time of day and under similar circumstances.
Perhaps you will get lucky a second time. This time, however, you can be more prepared with your camera and other equipment. There is no guarantee, of course, that the spirit will reappear. These phenomena seem to happen where and when they want to. But now, at least you'll know what to do if you do see a ghost.