How do you attach swarovski crystals onto a wedding dress?

I bought my wedding dress its very beaded with crystals. They are clear and I want to add some pink crystals. How do I do it? Glue, sew? Please help! I have no clue on how!
I want to do it myself cause it will be lots cheaper than paying someone. What kind of tools do I need to do this with?

If you are able to find a specialty bead shop in your area, they may carry Swarovski crystal beads, with the holes already in them. Then you would just need to sew them on. Below are a couple of sites where you can order these beads.

Also, in looking around, the best glue, if that is the route you are going, seems to be e6000. There is a site below for that, too.

Hope this helps.

Pink Crystal Beads
Pink Crystal Beads
Pink Crystal Beads