Thanks, @cipher, this looks like you've already spent weeks planning. I'm certainly good for the first four days, no matter how the final selection of courses works out. I'll probably be happy to play Lawsonia Links on the way out if I have company for that. Thanks again to both you and @iacas for everything you're doing.
Find a soccer field (they play soccer in Ireland, yes?😃) and hit full 9 iron shots. That's what I did during our lockdown in April. When I was craving hitting the driver I went to a recently closed driving range, snuck on, and hit old balls. Good thing 'cause the grass had grown to almost 7-8" and I lost almost every ball.
Hmm, lots of theories that aren't that different than what he is stating. Martin Ayers called his "bow and crossbow". Martin also loved long hard to stay focused on youtube videos. (I admit to skipping around on this one)
He is wrong when he says it is on plane here
That clubface is WIDE open and unless he compensates, a slice, push, mostly bad things will happen. His lead wrist is in cupped. Yuck!
The golf swing has so many things going on. Much of what he is saying is good stuff, however, I think other instructors do a better job simplifying it. Shorter videos that taken as a whole are better for consumption.