Foreigner said:
A guide to make a demonic possession happen? What are you, crazy?
Indeed you have to be certified craaaazy, to be able to wield a Demon then place it back safely where you found it.
Such practices are not to be advised, and if you have to ask here, how to do it, I would suggest you never attempt it. Atleast in this life.
There may come a point where you encounter one of these ridiculous, arrogant, hippocrites, who claim to fear nothing. Holding such an obviously blind position, they are clearly consumed by their own ego and self worth. This can create a personality that gets off on dominating others, especially by attempting to inflict fear on their perceived 'prey.' These people can generally be managed by various methods without calling upon certain entities. But every so often, if you are in tune enough with your own fear reaction, you will find they may attempt to completely paralyse you with fear. At this point, they have gone too far. They now need to face the very thing they claim they don't have - fear (people who claim to fear nothing generally stink of it). You may even see it as your duty to show them something so scarey, that it shocks them into recognising that they are actually shitting their pants....
I've only done this to a pretty extreme level once. And suffice to say, he won't be trying anything like that again...
I didn't particularly want to do it; it is extremely heavy on the body and mind, but, there were no other options. Thankfully such examples are very rare.
Edit: Also, bear in mind we probably have wildly different interpretations of what a demon actually is...