While doing the UX research, ask people to show you how they go about achieving their goals!
When the interviewee is explaining, “I do this, and then I do this and then I look at this in order to…,” ask them to show you how that happens.
You may watch them struggle to press a key combination, or you may watch them wander around the screen before they can find the link that they’re supposed to click on. Those little things you see will tell you an awful lot in addition to what you’re hearing. When it comes to user behavior, seeing is most definitely believing.