A big key to manifesting is making sure that you are a vibrational match for what you are trying to manifest. That is actually the reason why some who teach the law of attraction tell you that you must be able to feel what you are attempting to manifest. What I mean is that if you are trying to manifest love into your life you must actually be able to feel as though you already have that and are currently living it. If you are living a live of love and joy where no matter what is going on in your environment you feel much love and joy and you spend the majority of time living from your heart and not your head then you will find that you will manifest the love you want because you are a vibrational match to it. Of course if you are living in anger, frustration and resentment you can understand that your vibrations will be a match for those things. So obviously you will not manifest love if you are instead a vibrational match to hate, anger and resentment.