Definitely watch the videos. I can tell you having done GDPR legal risk assessments for the past few years that if you're only thinking about this now, you're probably too late. The good news is the regulators are 1) going after low hanging fruit first (Facebook, Google, Apple, etc); 2) many of them are in disagreement about enforcement and priorities; 3) much of this is really about pseudo-taxation (hence the 4% of global gross revenue scare tactic); 4) some regulators are going to fight about who "gets to" go after certain companies; 5) if you're a tiny solo shop that does messaging apps, the likelihood of you even being noticed is so slim that closing up shop is really extreme; 6) compliance is probably easier than you think if you are that small.