I expect Andy to be really ready for the AO. I am sure he will be focused from day one and will take each match very seriously. He will have to keep things together mentally for two weeks and must keep that first serve percentage consistent (60%-70%). He can't allow himself to think too much during a match - only what's necessary.
With Ivan behind him as mentor, he finally has what he's been longing for a long time. Someone who's been there, done that and worn the T-shirt. In other words not an "expert theorist".
Andy said recently, it is the mental, preparation side of his game, i.e. coping with the pressure before and during the semi/final that Lendl will help him deal with.
It's early days I know, and we cant expect Andys 'problems' to evaporate altogether after 1 Lendl week, but I am also quietly hopefull. Its the mental boost that Lendl will provide first and foremost. Later I hope he will improve Andys serving, for starters.