If the blades need a lot of work, don't try to take it all at once. As for direction, I sharpen from the cutting edge in, just like sharpening a knife, but you found contrary advice, so go with whichever way works best for you. outdoors when possible, I often clamp my blades to a saw horse. You can put it in a vise or clamp it to something. If you are using a hand held grinder, the piece needs to be fixed. If you use a bench grinder, as Mark mentioned, the tool is fixed, so you make sure to have a good grip and good control on the blade before engaging it with the wheel. I have used both bench and hand held grinders, and prefer hand held, mainly because it's easier for me, may vary for you, to see what I'm doing. So the first thing you need to do is address that. That's why, for example, inverted trash cans don't make good table saw stands.
There are exceptions to anything, but, in general, when using a power tool, either the tool or the piece is fixed.
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