I've been getting into BJDs a lot recently and I also ordered my very first BJD too! :D It's not Limhwa Half Elf but totally different brand, although more human like too :) I won't say which one, I'll leave it as a surprise for you.
Secure it with elastic band or just tie a piece of string around doll's neck. be sure that it won't slip off while you're gluing the hair.
I also draw the hair line to see where the hair should end. I used normal black pen.
The person that wrote the other tutorial, has used epoxy glue. I don't really like it, because it dries too quickly and I haven't got much time to apply hair strands slowly and precisely. Therefore I've used other glue, Evo-stick, serious glue. It was sticky enough and it dried quite quickly. I was considering Tacky glue but it didn't dry quick enough for me. I needed a glue that would dry clear in about five minutes.
First I started applying hair strands from the bottom. I was taking thin strands. First I was applying bit of glue on the head, then hair, a bit of glue again, and then using toothpick, gently rolling it onto the surface. This way hair was covered in glue thoroughly and it kind of smoothed and "spread" itself on the surface. Remember to hold the hair strand with your other hand, just underneath where you're applying glue. It gets really sticky :)
After I finish first layer and it dried completely, I started applying next ones. I didn't apply it just above, I left a bit of space between them.
I also drew lines on the top of the head, to know in which direction hair should be situated.
I think I applied four or five layers of hair strands until I got to the top. And this is the trickiest part of the whole process. As you can see on the photo below, the top of the head doesn't look nice. It has little "nest" of dried glue (i don't know if you can see it clearly). I wasn't shure how to finish it and then i got the brilliant idea :) After the wig had dried completely, I took a need le tool and poked a hole in the middle of that nasty "nest". I took piece of wire (that was the only thing I had :), made a loop at the end and attached thicker strand of hair to it. Kind of like needle with the hole and hair in it :) I used this wire to pull the hair through the hole in the wig. Then I glued hair inside of the wig and cut the excess after it dried. I also applied a bit more glue too, to be sure that hair won't come out when pulled.