go to the link above and if you scroll down you'll see a post regarding button braiding. But unless you practice before hand it might be easier to find a braider, IME... it can be tricky if your not used to it.
that is a great video, very descriptive and you can see everything.
I would like to note that the current trend in dressage is toward less buttons however. I believe this was recently talked about here on COTH, and it was something like that the upper level guys seem to sport something between 7-13 buttons? Not that that is a "must" or anything, but I guess, if we're all trying to be fashionable
(though... I have NO IDEA how I'd try to get 7 into my guy's mane without it looking like a total wreck!)
http://dressageesquire.blogspot.com "The ability to write a check for attire should not be confused with expertise. Proficiency doesn't arrive shrink-wrapped from UPS and placed on your doorstep."