Normal is actually easy. Hard is a completely different game, different strategies. it's easy to say just don't die but when you get massive splash damage, 2 hobs shoot you at once, any thing else damage you, you can be dead before you have the opportunity to move and if 1 person goes down, especially early, it can quite often mean a wipe. We have a regular sort of group we do it with quite smoothly, we have invited 1-2 random 29-30s on the odd occasion because they "had run the raid plenty of times" but that was on normal and in the end because of 1-2 persons lack of knowledge and or experience it was not possible. You can explain all you want but it won't make them better.