On youtube, I have watched the three tutorials given by Anna Bates of the Quilt Roadies or as her website is known, Woolie Mammoth. If you just put in "Anna Bates Wool Tutorial", you should be able to find it. She uses two kinds of fusibles because she travels a lot and takes her wool stitching with her on the road. Don't know if you will want to do it her way but it was interesting to see her technique.
I watched her tutorials and found them very helpful - thanks for telling me about her