Hi Cathy,
Congratulations on your up and coming wedding. I wish I was getting married again, I really enjoyed my day.
With regards to wedding make up, get as many trials as you can at the counters in the department stores, (they're generally free or a tenner which you can redeem off products) so you can see the types of things they use and any tips they might have. Tell them what you want and how you want to look.
Clarins and Estee Lauder are good places to start. Their ranges are really nice and the make up tends to stay where it is put.
You mentioned mineral make ups, these are fab, try something like Jane Iredale or Glo minerals, these are salon based products only. The basis of the mineral make up is to be kind to the skin and stop it from causing too many blockages, reactions or irritations.
If you're going to go to a salon, again remember you're paying for the service and make sure you tell them everything you want and need, and the things you really dont like.
Take one of your bridesmaids with you so she can watch and if need be on the day, she can touch up your make up as and when you need it.
Try to get a recomendation of the salon you go to or see if they have any kind of look books or before and after pics.
There are also lots of freelance mobile make up artists, try searching on the net to get some ideas.
Sorry for waffling on, but as you can see, I love the whole subject of make up and beauty, it's what I do for a living.
Enjoy trying and make a day of it when you do.
good luck,
Kind regards
Claire