I have been that person, too. Maybe not the first to dive it, but the first one I knew to dive it.
In that case, you get as much information as you can and use your best judgment. "Judgment" is a word that, unfortunately, dive agencies are reluctant to use. They prefer black and white rules, and in many cases, those do not work. I argued this at length with PADI in terms of overhead environments, and I am happy to say that after they asked me to suggest wording for using good judgment for assessing overhead environments, they asked me for permission to use my wording for coming course revisions.
I feel like this is the case any time you dive somewhere new. In most cases we are given little more than anecdotes and hand drawn maps of even the most popular dive sites (or paid $10 for a laminated, hand drawn map) and you are off on your own. Nowhere I have seen really teaches risk management as it pertains to diving, but that is what we are talking about here.
What could go wrong, how bad could it be, and how likely is it to go wrong, and what can I do to mitigate that hazard? Given all of the above, is it worth doing? Being proficient at this process is probably more important than another drill in the pool.