In general, yes. On the less frequented ways there might be parts that are less well marked but once you start investigating that particular route you will come across comments from other pilgrims (of even in the guide books you will probably consult) that will tell you which parts you should be paying specific attention to.
Taking a map with you, or having at least a smart phone with Google maps at your disposal is a wise decision, just in case.
In bigger cities it can be a bit of a pain in the neck to find your way out. Just ask around; any local will be able to point you in the right direction.
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