You know how people go to National Parks? That's kind of how I see going to haunted places.
Some people go to just enjoy the scenery, hike, enjoy the sunsets and wander around and learn stuff, whatever comes to you. If you see a bear or a buffalo, cool, way cool, but you don't expect it or get disappointed if you don't see one. And if you do, don't bug them or get too close. That's how I go to haunted sites, no expectations, just instinct, learning.
Some people go to National Parks, and race around to take photos of the famous sites: Old Faithful, etc., ...more interested in taking photos to mark off a checklist or show off to other people, than sitting back and actually enjoying watching the eruption. Same with birdwatchers. Some people also go to National Parks and expect to see a bear by the side of the road every time that will not only show up on schedule, but pose for their camera. And when it doesn't happen, they are disappointed and say National Parks are ripoffs. Even worse, if it does, they get out of the car and get too close to the bear or buffalo, and we know how that tends to turn out!
Now if you are doing a formal investigation, fine, be structured. But the phenomena you are looking for tend not to show up on schedule. Be more instinctive and open, and you might have more happen.