In reply to Chris Huntington:
Genrally speaking anyone with reasonable fitness and coordination will be able to stay on their feet by the end of the first day and will feel like they can ski by their 3rd day so lessons aren't essential although once you feel you've reached a plateau they can be useful to help you move on. That said if the cost isn't an issue a lesson or two early on should get you going sooner, i.e. before your holiday to Morzine.
My advice on lessons would be get a private one to one lesson not a group lesson, an hour or two with your own instructor is worth a day in a group. Group lessons are a way for parents to get rid of their kids for the day so they can enjoy themselves until their kids can ski properly!
Also, don't start off with a lesson at the start of your first day. Instructor or not, you WILL spend the first few hours falling on your arse and paying an instructor to watch you do this is a waste of money. Spend your first half day practising snowploughs (watch some other people having lessons to see what they are doing and try to copy it or watch some youtube videos beforehand). After half a day of that you will already be developing a feel for how to stay on your feet and you will get much more out of your lesson.
Enjoy yourself, its worth the initial effort.