I recently wrote something where I indicated a technical task was not for the faint at heart. What I meant to say was that the task would require a lot of technical knowledge which most of the audience would not likely have. They would need to spend time and effort to learn technical details they probably wouldn't be interested in. So a task only undertaken by someone with the appropriate technical knowledge or someone highly motivated to learn how to do it.
Upon re-reading, I realized that some might take this as implying that if they couldn't or wouldn't do such a thing, they were in some way inadequate.
Without starting an endless debate on whether or not the expression already removes that implication, could I have put it better? If I had been speaking, I wouldn't be concerned, but writing lacks the nuance of delivery.