We've just started shearing and we were wondering, what's the proper length of wool to leave on the sheep? Do you shear all the way to the skin? On the couple we've done we've left about 1/2", but that doesn't look like enough. Also, after only two sheep and our blades are dull already. They're gummed up with a lot of lanolin. Can anyone give us some detailed instructions on sharpening the blades and on keeping the lanolin build up off between sheep? I drove all over today and no body sharpens sheep shears. I can't imagine buying new blades every couple of sheep! Thanks!