So I finally have my wife's bike almost put together. The only thing I have left is the disk brakes. It's the new XTR disks. I'm a pretty good bike mechanic but I've never had to deal with disk brakes before. The instructions that came with the brakes suck. Do I fill up the line with mineral oil before putting it on, or do I assemble everything first and then bleed the lines.

Thanks for any help.