Hi Baby Duck-
The major problems about any kind of transcendental experience, including kriya and other yoga types begin with disorientation. If you don't know who you are, and can't "reset your system" after going into spiritual hy[perspece, you are a candidate for a brief psychotic episode - and if you're a schizotypal personality, it may last for quite a while. The cure is to make certain that you do yoga to join with God as a part of God, so that whatever happens can be accepted as a gift from God.
Another problem is the abrupt awareness of all our sins of omission and comission. Here you are, bare to the core of your soul, facing God in some manner, and the idea of getting angry at someone, or cheating the government out of a dollar on taxes, jaywalking against a red light and all manner of trivial stuff gets called up against you. "Please God, don't exterminate me ..." is the usual response, and we feel like we've been devoured and pooped out again as waste. This can lead to major periods of depression. The cure is to rely on such awareness as a new and highly useful sensitivity through which you can avoid errors in the future. (Its value is like a good clinical thermometer.)
The biggest danger is getting sidetracked into looking for the bells, whistles and colorful displays of psychic phenomena, as well as the bliss that accompanies them, which leads back into the everyday world. Some people spend lifetimes trying to attain a blissful experience that they recall from before. The cure is to accept the payoff as a gift, but to work for unity with God in all confidence that when youget there, it will be fun.
Then there's the "fear of death" part. If you do certain exercises, such as holding your breath until you pass out (your internal systems normally reset your breathing, although not always - and I can tell you from experience that this is a very uncomfortable process to "force") you have to be willing to trust that God will care for you and bring you to whatever experience and outcome you require. If you panic halfway through, it can be terrifying. The cure is wait until it happens spontaneously.
Another trap is development of siddhis - psychic powers. I use Juditha as an example because most of us are aware of her recent history. It was possible for her to go into the ego trip of "I'm wonderful" and to work toward more powers, neglecting her basic value to others. She is an excellent example, because she has stayed on task to be useful, and that will pay off. Those who go after more powers tend to get into "black magic", which is a good way to create karma for a few more lifetimes. If you simply plod on, doing good works, you'll prosper. Look at Bruce's influence through his willingness to share his understanding and to allow others to participate in the same kind of growth.
Then there's the "I think my body is breaking down" trip, in which we sense heartbeat and inner pulsations of pranic flows and go into panic mode. Thisis especially from "forcing" matters, as opposed to simply meditating and growing. The cure is to take it easy and to allow everything to occur naturally.
Finally (but by no means last in terms of possibilities) there's the "Jesus Trip", which can also be played out with any other major figure. "I am Jesus so I must save the world." and then after a few months of meddling where we are not wanted we get the second part, "Why do they all want to crucify me?" The cure is to just be yourself. Jesus is available in person, and if needed will arrive. Otherwise, just do your thing and love and respect others.
In general, kriya is one of the safest paths. However, if you simply dedicate your life to becoming one with God, no matter how it might happen, you'll arrive anyway. Yoga simply is a bit faster, and with a good teacher there is no danger. All the hazards arise from lack of preparedness for the experiences we unleash. This is precisely why LSD both enlightened a lot of people, and also drove a lot of them bonkers. As a last resort, no matter what happens on the roller coaster of life, dedicate it to God, own it for yourself, continue to love, and be aware that in the end even the craziest and most unpleasant experiences will benefit you spiritually. Then go on and see what happens next.
Now - having said all that, I feel obligated to add this: If you learn to do soul retrievals from Bruce's materials, and practice doing them, you'll get the same benefits as doing other types of yoga. The hazards are the same, but much more obvious in this context. And it's fun!
http://www.afterlife-knowledge.com/yabbfiles/Templates/Forum/default/grin.gifenjoy!
dave