Welcome to the forum and you will get sound advice from the members.
If you antara is diesel, one thing that pops up is the DPF regeneration, different members have various views on this but I myself have had no problems with it, Mine is a Amtar SE Nav 185 2.2 Deisel Auto.
You will be looking forward to your car and I hope you enjoy it a I thing it is exremely good.
There has been some discussion re. mpg.
Personally I am happy with mine so far [ 34 local and 27 towing ]
others have reported much lower results.
Also you will probably find that the kind people at Vauxhall have provided you with an inflation kit if you are unlucky enough to get a puncture.
If this is the case - and you do get a puncture then be aware that you will need to replace the tyre when you take it in for repair.
Also - if the puncture is in the side wall the kit is of no use.
I, and others here, have elected to buy a full size steel rim and put a suitable tyre on that. Peace of mind.