Fionnuala, don't panic!!
Firstly, take your lawyers advice! You are, I would venture to suggest, better to complete in January (if it suits you) to avoid any wealth tax this year. When the habitation licence was granted for our block in phase 2 (it was September or October 2006., if I recall correctly), we delayed, on our lawyers advice, until the new year and eventually completed in February this year. I don't know what the completion date is on your contract from the developer, but would anticipate that they are well overdue in handing over the property (we were meant to complete in March 2006). So, sit back and listen to your (hopefully) competent lawyer.
Don't worry about furnishing it either, unless you want to use it immediately! Think about that after you know when you are going to complete.
We, personally, used power of attorney to complete, given to our lawyers, as we are here in Dubai and it wasn't practical to do it any other way, but this is a decision you should make yourselves. Get your lawyers/yourselves started on your NIE (we organised for our lawyers to do this the summer before we completed, but I believe the law may have changed regarding getting your NIE numbers).
When we were there in August, block 17 was coming along nicely, as was block 15, but, again, listen to what your lawyers tell you and don't rush to complete! Wait until the new year, at least.