Likewise, I use GPL software daily, for a living - doesn’t mean I’ve ever read the license.
You need to care about the bits around the actual chess playing, but regulations for these things are overwhelmingly made of "play nice, be reasonable, don't be a dick" rules. If you try to play by those high-level rules, apologise if you break the nitty gritty of the low-level rules and fix things at the earliest opportunity, it shouldn't be a big issue. Also, things like dress code can easily be a "not an actual rule, just convention" sort of affair.
They’re professionals because they understand the game and are in the top 1% of people who play it. Not because they are the best at memorising rules. The latter group are people Who become umpires/referees instead.