Hm,even if you manage to summon the demon you have to face few very serious problems.First, controlling the being that has been dragged against its will,then you will have to deal with all kinds of another spiritual beings ,that the demon and your actions disturbed.The Dead for instance do not like "the devils". Deceased, often combine their energies to push them out,when they sense them.Any sort of magical working attracts the dead too,and you can end up on their bad side too.They also tend to protect their territory, and often do not act alone,dead are smart enough to know that group of few can achieve things better.
They will be not happy if you use Ouija for calling demons,that will probably enter their territory.Not to mention that natural spirits and angels do not like "the devils", either.They go well only with the shadow people.I will think twice before transforming my bedroom into spiritual battlefield and getting myself between the smashing power of two constantly fighting fractions ,that I just managed to drive to state of pure rage.
Never underestimate the power of spiritual beings of any sort,they can mess you up very badly and especially if they are all against you.
You should not only think about your own safety,there are other forces out there that inhabit our living space ,even if most people are not aware of them ,they are pretty much aware of us and all we do.