Challenges of a UX researcher involves understanding what users are saying in real time and not a survey of pre recorded video. Skills are required to understand the motivation of users, who often hide aspects, and you have to also analyse insights.
As a user experience researcher, the main challenge is to buy a small sample from the stakeholders on your rate. UX Experience Research Job is all about convincing them that it is equal to the large sample. A User Experience Research is to collect generalized data based off of a mix of qualitative and quantitative data.