Hi Sebastian
I can answer the two questions but they could be taken in so many different ways (interpreting)
You can stay for months in a remote place getting bit my mosquitoes etc and come back with a poor image. We are not talking about assigning a "difficultly" factor to the image as judges would do in diving competitions.
Just one case in point, Eagles. Many photographers would love to have an image of an eagle grabbing a fish. Seems difficult, unless you go to Alaska, get a guide with a boat tossing fish out the back. Will fill as many cards as you want using a 70-200 lens.
Lots of wildlife images are shot in parks, here in the States, Yellowstone is a prime example. I am not saying an image made just outside the park is better than on inside the park.
The point is disclosure, say what you did. This is common with birds, phenomenal images of raptors involve bait. Not judging to be wrong, but would be nice to disclose or at least, give the information if asked. The point is not making a false impression. I am familiar enough with raptors and know how the image was made, no need to tell me. Still appreciate the image in every way and my complements go to the photographer.
This is one of those never ending discussions, ironically very simple. Just use common sense.
al