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I make that first plunge cut about 1/4-1/2" earlier on the blade then after it is all ground go back at a slower speed to do that final plunge-clean-up. This is where I've found doing the clean-up on the plunge works well on a variable speed grinder. The slower speed is easier to manage. For those times I come in slightly off, the slower speed doesn't turn the blank into an "oh ____!!!" moment.
Early on I was attempting to grind a particular line on the blade and duplicate to the other side. That was when my mentor relayed to me to not do that because it brought more challenges in those early days, just grind/wash it up to the top. Had enough thin ones along the way. Comes with practice and you'll develop the feel for how the steel is being removed to sense it. Muscle memory too, you'll develop a position that works for you to be accurate.
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Mike 
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