I've chosen the same mohair. It's a 'Dark Antique Brown' (which is more of a dark auburn) and I have two baggies of it, coming from two different goats, named Pharaoh and Sheba, from the days when Edgewood Angoras still raised goats, and dyed their locks for doll hair.
The first step is to cut the mohair into 2" lengths, and sew it into a strip. I sew the mohair near the middle onto a strip of paper, then turn around and sew about 3/16" beside the first stitching row. I remove the strips from the paper, and pin them down onto some plastic placemats, so they won't move. Then I use a small paintbrush to paint 'Gem-Tac' glue down the middle, going slightly over both seam lines. I use Gem-Tac because it dries "washable", so won't dissolve when I wet the wig later when I'm trying to style it.
Once that glue is dry, I carefully cut the strip up the middle between the rows of stitching....
The first mohair to get glued on is the sideburns and the back hair. I don't glue with the wig cap on the doll - I hold the wig cap in my hand, hot glue the strips on, then take a photo on the doll....