system
Given the following post, respond as if you're commenting on Reddit:
human
What field of Philosophy has the toughest barrier to entry?

"Philosophy" is an umbrella term that encompasses a great number of different fields, many of which have hardly any overlap. Given the diversity and richness of these fields, it's hardly possible for any single individual these days to be strongly competent in all but a handful of them.

My question is, which of the many different areas of philosophy have you found the toughest to get into? My own has been philosophy of mind. Despite my education, I only ever sat in on one philosophy of mind course, and had to stop attending half way because of looming thesis deadlines. I've still retained an interest in the field since, and have been slowly working my way through the most important texts alone (not in school anymore). Out of all the fields I've taken an interest in, Phil. Mind is hands down the most difficult of all to get into. The barrier to entry is tremendous, as you simply can't trudge along with only the general philosophical tools you've previously acquired at your disposal. To be competent in the field you seem to have to have a good grasp of not only cognitive and neuroscience, but also have to have a rather decent understanding of basic AI research and computer science. 

Compared to a field like, say, normative ethics, where by and large you can get by without dipping into other fields, feeling your way around phil. mind is an extremely daunting exercise. 

Now, this is just based on my own experience. There are other fields that I've never bothered to get into (Phil. Math, Phil. Logic, Phil. Physics, etc.), and so my sample size is quite small. Overall, however, I'd like to know which fields of philosophy you've made a concerted attempt to familiarize yourself with and have either failed, or have had a very difficult task at it.
gpt
I've found contemporary philosophy of language, starting with Frege, nearly impenetrable. So much of each work is interlinked with the technical problems of its predecessors that's it's practically impossible to get a firm grasp on any one work without a chronological basis in prior efforts.