Who should be investigating?

There is much debate on this topic. What type of person does it take to investigate the paranormal? Personally, I don't think this field or investigating is for the faint of heart. If you are easily scared or get paranoid at strange sounds than you need to be elsewhere and not waste your time with this.
I see new groups popping up left and right as if candy was being handed out. Some of these new groups have the type of people who should not be going on investigations. If you have someone of this nature in your group who is constantly freaked out by the investigation or anything potentially going on in an investigation, you need to remove them from those duties immediately. At the same time you need a better screening process when choosing new members.
This type of person can scare a homeowner or clients. By them showing fear or emotion towards what is happening, it will reflect back to the homeowner and they may not take you seriously if you have a person on your team flipping out that they saw a shadow. You need someone who is calm, cool and collected in these situations. Not necessarily unafraid of what is happening but they do not wear their emotions on their shoulder.
It's ok to be scared, afraid or even a little nervous about a situation. If you are showing that though it is not a good thing, your fears will spread like wildfire throughout your team and all of a sudden everyone is hearing and seeing things.

If you have someone like this on your team or if you are someone like this, think of a different capacity that your talents can be used. Field investigating may not be for you. It doesn't mean you can't still work in paranormal. Just in like an office setting or something along those lines instead.