My own opinions.
If we require spirit to come to us with help or guidance then we must ask them in the correct manner. They are spiritual beings and will come of we call, but only respond in a fashion that is suited. If we ask for their help with humility, they will always give it to us, in whatever way, shape or form that they can. This help and proof can often come to us in a very dramatic clarification. If we demand of them, then the answers may come, but may be harder to decipher.
Suppose you merely demanded readings from a medium without giving that medium the respect that they deserve. This will affect your chances of recieving positive guidance. This then makes you doubt the quality and integrity of the medium, when really all you needed was to show respect and humility. The love from spirit would have gushed forth.
Please don't take others mediumship for granted. Just because they have developed their gift to a level where they can help you with your problems, don't think of it as your right. It is not your right.
Most mediums will help where they can, and be only too pleased to do so. This does not mean they are at your beck and call whenever you need guidance.
Try to think ahead and ask yourself if you could possibly sit for five minutes and ask for guidance from spirit yourself. You may recive the answers you are seeking.
When you really need love and guidance from the spirit world, it will come to you no matter what.
Patience, love, respect, gratitude and love all play their parts in drawing the right guidance in close.