The risks of splitting can be classified as natural and "supernatural".
The natural order problems can be caused by various engrams which, in turn, can result in the person trying to unfold disorders physical and mental and nervous disorders also. A person affected may have symptoms of nausea, tachycardia, dizziness, depression, etc.. These symptoms may be caused by the shock of who makes the first astral travel.
The splitting is not for people who are very impressionable. This is definitely an experience capable of making an individual indelibly and if he records a lot of new knowledge, feelings and possibilities, will also be in the presence of certain dangerous factors, which should not underestimate.
I'm talking about the bad phenomena called "supernatural", that can affect the integrity of 10% while "traveling".
I mean the intervention of other entities spiritual vibration levels, as playful energies, demons, elementals and spirits of error, they can try to traumatize our 10% when traveling the astral plane, reducing their energy and inducing having visions.
Those closest to our 10% are the spirits of error that desencarnaron recently and are not resigned to detach the physical world. His ego will create a fictitious physical world do not accept the change of plane.
They are the greatest danger to the individual unfolded, they seek contact to ask what is happening. Unconsciously know that "something happened" but can not understand what it is.
Others, possessed by envy and resentment, seek to induce confusion, to hinder the reintegration of 10% from the astral plane.
In such cases, when the person completes its 'journey' feel something stuck out energies, as if his body was completely exhausted.
Protection for the split.
As mentioned above, there may be spirits of error attempting to contact their 10% during astral travel, whether to give or to discouraging messages that display images that cause you concern.
For protection during the projection, try to build in his mind a golden protective hood, projecting a ray from the 7th plane and view your entire being within that campaign.
The same, by issuing high vibrations will interfere with the dense institutions emissions levels low.
His First Voyage Astral.
After a long preparation we have reached the turning point. Everything is ready, the clothes, the atmosphere of the room, a light meal and a warm bath with sea salt.
After learning on the astral plane, executed all preparatory techniques of relaxation, breathing, concentration and visualization, have determined the most favorable time, read about the split and learned some techniques to unfold, you are ready to make an astral journey.
It only remains to say that it is helpful for your internal development!
 See The Sky answered I, where are listed the various spiritual levels, and the entities that inhabit them.
 Alpha is the name that designates a state of consciousness. The same is designated as Alpha in contrast to others as brain waves that are generated in each one of them are recorded by the electroencephalograph. For example, when you are awake Beta waves are being generated and to enter deep sleep, Delta and Theta waves consecutively. The alpha state is very short and it is experienced in the moment one begins to sleep and it is in this state where our 10% can start making astral travel.
 All is filed under hypnotic suggestion awareness levels of the person, which may cause, if accidentally restimulated, unpredictable mental disorders. Engramic or hypnotic implants can only be removed through Dianetics therapy. They are permanent if not removed.