Gordon,
The #050c, that's the one with the black plastic, Design Centre Award-winning handle I think? Er,
this one? Someone may come up with some instructions, but in the meantime the basic operation of the thing will be similar to all the other metal ploughs and combis, so you might find some of the instruction linked to
here helpful.
As you surmise, sharp blades are important, as is a fairly light cut. The key technique though is to start at the end furthest from you. Take a cut starting 3" or 4" back from the end, then the second one a bit further back (i.e. nearer to you), the third a little further back again, and so forth until you're taking strokes along the whole length. Interestingly I bought a copy of The Woodworker yesterday, for the first time in ages, and it says firmly that these planes are no good for softwoods. News to me, I must say. But it's true that some softwoods really are totally pains to plane, which may not be helping matters. Hardwoods are generally considered to be where the trouble arises, but as long as you're using reasonably straight-grained stock it's perfectly do-able. Oh, one thing to check; make sure the skates are straight, and also parallel to one another when you set the plane up. That can make life tricky if they're not. And a scribble of candle end on the sides and bottoms of the skates and side of the fence is often helpful too.
Sorry, all rather dis-jointed. Bit of a brain dump, but it might be useful. Yell again with more details if you think I might be able to help any more.
Cheers, Alf