I personally have never been to Antarctica, I haven't tried it either, so I don't know exactly how difficult it is to get a job there. But taking into account the experience of colleagues and some of the job offers I have seen I think it is important to have some previous experience in polar environments as well as having some physical fitness and mental strength. I would say that in all or almost all long-stay selection processes both physical and psychological tests are carried out. For fieldwork, I guess it's like everything else in science, it's important to have a good CV and be lucky to find the research team at the time they run a project in Antarctica. However, not only researchers have the opportunity to work there. On the research stations, there are jobs for computer scientists, mechanics, cooks, divers, and much more. There is also more and more tourism in Antarctica and there is a need for guides with experience in extreme situations to fill these jobs. Safety courses and experience in polar regions/high mountain areas I personally think are highly valued when it comes to getting a job in Antarctica.