So, this is the process *I* used to make my Juvia Loxar wig:
1.) I started with a long blue wig from eBay [link]
2.) Brush it out
3.) I used clips to mark where I wanted to cut; before you cut, MAKE SURE YOU CUT A LITTLE BIT LESS THAN YOU WANT, you might need it later. Also, MAKE SURE YOUR WIG IS STRAIGHT ON THE HEAD!
4.) Go ahead and cut! I just left the bangs alone, though.
5-7.) (I know, number 4 is listed twice; just consider 5 as both pictures) To form the curls, I cut my old conditioner bottle into two sections and wrapped the hair upwards from that. Then I secured the hair with clips
8.) SPRAY THE HOLY HELL OUT OF IT! XD I sprayed it with got2B glued hairspray; MAKE SURE YOU DON'T SPRAY TOO CLOSE!! I've done quite a few layers of this. After I thought it had enough "stay power", I removed the bottles and clipped the curls to the rest of the hair; then I sprayed the inside of the curls too.
Make sure you like the way the curls are aligned and then test it out!