Question: does Soulwalking have a chance of the target realizing what's happening to them? If so, what affects a target's ability to detect Soulwalking?

I need to know this for my next post.

Edit: I read the Soulwalker description again and have another question. Does Soulwalking only allow the user to 'jump' into someone's body or does it allow them to walk around as a spirit AND hop into a person's body at will? If moving around as a spirit is possible, are there common ways of people detecting and seeing spirits?