People do care about their kids no matter how old they are. Do this job long enough and it's inevitable that you will get chewed out on occasion. Trying to set up assessments can be stressful because sometimes I kind of feel like a salesperson. Sometimes you can feel their annoyance on the other end of the line thinking. That can be stressful.
Assessments are difficult because it has to fit into so many people's schedules.
The individual's motivation can be a barrier sometimes. I worked with a girl who was constantly late to everything. That affects our schedules and the people who are expecting us to be there. Transportation can also be a huge barrier. Honestly, I prefer to do the driving to the assessment sites sometimes because then it's under my control.