In particular, watch 4:45 onwards.
The 6 ways detailed in the article is absolute rubbish (the article is really just promotional material for the movie The Bye Bye Man). While there are a variety of effective modalities in applying to the de-intrusion process, all will (directly or indirectly) involve addressing the energetic psychical resonance that allowed the intrusion to occur in the first place (which are not limited to intrusions by so-called 'ghosts', or the more scientifically accurate term : psychotic post-mortems, ie. consciousnesses that are psychologically unstable after physical death). It is not appropriate for me to elaborate on this matter on this forum. Just mentioned this because the Yahoo article was awful rubbish.
A brilliantly educational movie, which rather accurately portrays the efforts to facilitate the transition for many psychotic post-mortems, people who have died but are in denial of their own physical death. Religions won't teach you this (as religious leaders themselves are unaware of these after-death matters), but this actually happens in real-life or should I say, real-death, if you'll pardon the pun.
There are several other educational movies that deal with similar or related afterlife themes. PM me if you're interested for my recommendations.