Most girls vision of a veil is one plonked on the top of their head, falling over their shoulders and hiding them and the dress. The most modern way to position your veil is to wear it further back, just behind the line of your ears. This will mean it sits behind your shoulders, and it will also feel less intrusive to wear. Make sure you take a loan veil with you to your hair trial because the position is key. If you are wearing the blush over then you will need it further forward or it will simply stick to your lippy which is not a good look on your finest hour!
Still with me? Almost done. The final thing to consider is to blush or not to blush - this is the part of the veil that comes over your face.
The great news here is that there is no wedding etiquette on this anymore. Traditionally the bride wore a veil during the ceremony, and once announced husband and wife the groom lifted the blush to kiss the bride. Folklore says this happened so that the father could palm off his ugliest daughter with the smallest dowry first! Thank lord we have moved on from that one, eh?
I think this is a simple choice and common sense; wear it over if you feel comfortable, if you want a more traditional approach, if your wedding is in a church, and from a practical point, use it to hide your blushes as you walk towards your groom. Then lift it back when you reach the alter, you simply have to be able to look into your groom's eyes when you say "I do".
Finally, trust your instincts. If a funky birdcage with vintage sparkle is more your thing than a cathedral length lace ensemble, go for it. This is the only chance in your life you get to wear a veil, so embrace it with both arms.