Not stressing at all, to tell the truth. My wedding is not going to be formal - a wedding at the botanical gardens, and an informal reception with hog roast etc at my dad's house up in the Adelaide Hills. I'm doing my own flowers, don't have a bridal party other than a couple of flower girls and I booked everything that needed to be booked about a year in advance (3 piece Swing band for reception, venue, harpist/soprano for the ceremony, chairs and chair-covers and lockable wishing well, the celebrant I wanted, etc).
I think the more elaborate and/or expensive the wedding, the more stress. If you don't have a seating plan then you can't get stressed over it! Same goes for bridesmaids, groomsmen (although to be fair FH would probably have a best man if one of his friends would travel over from the UK). I'm also pretty flexible on what I'm after - it just has to be simple but still classy as I'm not into cheese!
At this stage I don't think I'll turn into a bridezilla, but I am particular about things being right in my everyday life. I'm trying to overcome that though as that could bring out the bridezilla in me!