Yes I do as willimo says, the edge first them fill in with larger stuff. Pay special attention to crevices as the tape tends to lift and will allow paint underneath. You won't ever get the masking job perfect, a few touchups are generally required. But using matt paints and if the touchups are small, they will never be spotted. As with any masking job plan your colours too, lightest to darkest.
EDIT: And make sure you fill in those nasty ejector pin marks on the floor before masking and spraying.
Sorry to whoever the model above belongs to, the paint job is perfect making the ejector pin marks stand out even more! I guess they will eventually be covered by flocking or felt?