I'm not sure what the situation is in your country so maybe you don't have permits like I discuss in this post. In Australia it's required.
A rifle yes, in the case of these particular images it's a Tikka CTR chambered in .243 and I shoot it out to almost 1000 metres. Operating firearms is always risky and a great deal of care needs to be taken however have a go at me. Wild boars are another matter, with them, there's a great deal of risk of personal injury.
Are there a lot of people like you that do this?
There's over a million registered firearms owners in Australia but not all do what I do.
Do most farms need this kind of service?
Yes, pests exist on most farms, the type just varies.
Gotcha. Thanks for answering my questions. It has been very educational.