I've heard some people say they do a crumb coat. I've never done it. I try not to "lift" the spatula, I try to slide it off. When I have pulled up on it is when I notice the crumbs. Probably not much help, sorry. Hopefully some of the veteran's can be more help!
Welcome to Cake Central.
The easiest way is to apply a crumb coat. You may need to thin your icing a bit. Spread a thin layer over you cake, gently, creating a smooth surface. Don't worry excessively about a few crumbs. Let the crumb coat set (refrigerating helps).
Once the crumb coat is set, apply your finishing layer of icing.
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