As with any powerful, mind-altering substance, go at your own pace and only do what you are ready to do.  Sounds as if you are approaching this with the proper amount of respect (just watch those high dosages).  I would add that it is natural to feel somewhat (or very) disconcerted when you are first pulled away from your own ego.  The ego is what you have thought of as yourself for most or all of your life after all!  However, there is a great reward in overcoming that fear.  I have personally found that it has left me with far less fear and anxiety concerning death, and I am happier for it.  I wish you the same.