You have to feel it and assume it to manifest it. Manifestation starts within you. It starts with your thoughts and emotions. When you get those in alignment with your manifestation, your manifestation will come to you. Your inner world is a blueprint for your outer world.
Make sure that your thoughts are serving you. Make sure that your thoughts are supporting your manifestations. Make sure that your thoughts contribute to your happiness and well-being. You are the only person thinking inside your head. Choose thoughts that serve you. Choose feelings that serve you. Your thoughts and feelings are the foundation of every manifestation. The better they are, the quicker you get your manifestation.