Q&A: What is the best way to insulate our attic when no soffit vents are present?

Question by Kate: What is the best way to insulate our attic when no soffit vents are present?
Our 1929 Chicago bungalow, like many of the homes in our area, has no soffit vents, only the original concentric exhaust vents closer to the ridge. From the outside the soffit vents appear to be there because whoever sided over the original wood put the vent pieces in the siding. However, inside the attic it is clear by the design of the house they don't exist. The roof trusses are notched to

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