Speaking with one’s guardian angel is perhaps the greatest thing that one can achieve spiritually. There are many benefits to gain from union with and conversation with your holy guardian angel. In Magick Without Tears it is said best as
“It should never be forgotten for a single moment that the central and essential work of the Magician is the attainment of the Knowledge and Conversation of the Holy Guardian Angel. Once he has achieved this he must of course be left entirely in the hands of that Angel, who can be invariably and inevitably relied upon to lead him to the further great step—crossing of the Abyss and the attainment of the grade of Master of the Temple.”
By attaining union with your Holy Guardian Angel you attain union with your divine consciousness itself. The more adept one becomes in magic and life itself the closer the union between divine and man. The ultimate goal to be the relinquishment of ego-self and reign of divine consciousness. The methods of conversation with guardian angels range from the ludicrous such as Abremalin’s method which can take up to a year to complete; to others that require the magician to summon all of the Goetic demons.
However both of these are quite eccentric and equally unnecessary; unless of course you are quite eccentric then by all means it may be worth more for you to research the matter. I myself have found the easiest method to be the method Israel Regardie uses in his Holy Guardian Angel lecture.
There are more methods still, one particular method to note is not based on western magic but native american shamanism. This is by far my favorite method and I find it to be the easiest to do.
One can either lay down or sit comfortably in a chair for this; to begin relax the muscles in your body. Begin breathing to a count of 4 inhale, 8 hold, 8 exhale, 4 hold; while you breathe close your eyes and focus up on your third eye. The time that follows depends upon the individual but you will eventually start to see colors move in front of your eyes in a tunnel like fashion. When the colors are of a consistent violet/purple color we can begin. The purple is representative of our higher vibratory rates. It is at this time that we can either out loud or silently to ourselves petition our holy guardian angel for help. You can ask it questions, talk with it etc.
This is a more active method to converse with your Holy Guardian Angel as opposed to a passive approach of wait and see after you have contacted them. So what is happening when you speak with or join you guardian angel. Well to put it simply you are now becoming consciously aware of the things that would influence your pendulum magic or tarot card readings. The advantage of getting in contact with your divine self is that you start to eliminate the middle man. You will no longer need such ephemeral as pendulums, tarot cards, or ouja boards; you can now ask yourself the important questions and get answers. Eventually as you become more and more aware and skilled at contacting your divine self; you will be able to stop using “divining tools” altogether.