Firstly, congratulations on booking a days coaching, especially a 121 session, it may well be the best thing you have done for your riding ever.
Secondly, please do not go into it with preconceived ideas of what you want to be coached, the coach will watch you and decide what he can do for you to help improve your technique across the board and in specific areas, yes you should mention these.
In my opinion spending valuable time learning how to manual would be a waste and is unlikely to resolve your face plant over 3 foot drop issue.
An open mind and a little preparation will ensure you come out a far better rider than you went in.
When i say preparation, take plenty of food and drink, it is surprisingly tiring learning new skills (and unlearning old habits), both on the body and the mind. Make sure your bike is in good nick and set up how you like it, yes that does mean with the pedals you normally ride. Be prepared though, the coach may well advise changing a few things like brake lever angle etc (this may be part of the solution to the face plant problem).
Lastly, enjoy and please report back.
I realise you missed the fact that I had already been on the session when you posted, but reading your post, its spot on advice for anyone doing a skills session IMO 🙂