I just try to try to keep an attitude that I don't know what I'm doing. Not to the point where I'm beating myself up but I just go in thinking that I have a lot to learn. And I hope I still have that attitude 30 years from now.
It's rather naive apart from being ethically objectionable to assume that our investigators travel around the country with bags of money trying to bribe witnesses to lie on the witness stand. We just don't operate that way.