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Richard,
I totally agree with everything Bill has just said. I would like to add one thought: if you think in terms of painting (or repainting) an area rather than an edge, then the reworking of the area contains edges which can be handled the way Bill describes. It's like a home improvement project: one thing leads to several others, so you might as well do them all at once!
I also find that using medium tends to create crisper edges that are harder to soften with an economical use of brushstrokes, so I've been using no medium for several years. My first layer of paint is thinned with solvent, which dries or becomes tacky pretty quickly, so if I am painting another layer on soon after, it doesn't become messy and muddy when I return to the same areas. Another way to soften an edge is to take a relatively clean, dry brush and run it over the edge. I've noticed that edges become truly fun when you have more control over them.
Alex
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