The short answer to your question about vibrational match can be summed up in the question -- "how do you feel"? Jesus talked about "vibrational match" when he said, "fear ye not evil", "turn the other cheek", "do not talk about this to anyone", "be ye transformed by the renewing of your mind", and "as a man thinketh in his heart, so is he".
You will know you are a vibrational match when your dominant feeling is positive. Your attraction meter (which registers your vibration) is your feelings. Your inner guide speaks to you through your feelings and is saying when you feel positive - "hey, keep going - you're in alignment with what you want" and when you feel negative your guide is saying - "hey, stop, you're NOT in alignment with what you want". (Abraham via www.Abraham-Hicks.com explains this wonderfully in their audiotapes)
When you feel predominantly positive then you are predominantly in vibrational harmony with your desires. Any slight feeling of negativity, even as slight as ennui, lethargy, or resignation, is your signal that if you keep thinking the thoughts you're presently thinking you'll create something out of harmony with what you really want.
For example, let's say you want to attract your ideal mate. In order to become a vibrational match you would meditate on your desires for a partner, work diligently on becoming all that you want your mate to be, choose to be fulfilled and in joy in all that you do and focus on taking action both spiritually and physically to create your mate. If this were all you did, then you would be a vibrational match to your desire.
However, since most of us are human, we look at what we're getting and if it isn't exactly what we think we want then we reject it as a failure, a mistake or a poor joke played on us by the Universe.
Let me illustrate this point by borrowing a client's recent challenge. Being a physically fit, totally health-conscious, energetic, youthful 55-year-old widower with a verve for life that is highly contagious, this client was experiencing "signs of land" that were either "too old because they weren't fit, healthy and energetic" or "too young because they didn't have the emotional maturity or hadn't achieved career satisfaction and stability." It was easy for him to think positively when in the throes of visualizing and affirming in meditation. However, the challenge came when the results of his efforts looked like they were too old or too young at first glance. Upon observation, the doubts would instantly impede his mind and he would begin to spiral with the negative feelings of frustration, irritation, fear, sadness, loneliness, and unworthiness.
These emotions are the rocket fuel that expands our manifestations. The more powerful the feeling the more power you are feeding your creations. Those negative feelings are literally our Angels tugging at us and saying, "STOP! You're focusing on what you do not want!"
Fortunately, since it is impossible to monitor the never-ending stream of thoughts, we have a fabulous mechanism called our feelings that let us know whether we are a vibrational match to our desires or not in any given moment. Negative feeling = negative creation. Positive feeling = positive creation.
The key here is to pivot from the negative thoughts to positive thoughts. This is done not by denying that you are having negative thoughts but by reaching for a thought that you can believe and a thought that feels better. Here's the process simplified:
Ask, "What am I feeling?"
Then ask, "What is the thought that is creating this feeling?"
Then ask, "How can I surrender to the Divine Order and Divine timing of life now?"
Then finish with, "What thought feels better?"
If you feel negative (any shade less than positive) then ask, "What is the thought that is creating this feeling?" Once you've identified the thought, you want to do two quick things. First, surrender to the fear or the negative possibility by acknowledging the fact that the Law of Attraction is always at work and if this is the way it's going to be, then so be it - "I'll survive. Because even in death, I survive." Then finish with "What thought feels better?" and reach for a thought that feels better and that you can believe.
To clarify the last step in this process, if you are in the mire of negative mush then saying, "Every person I meet is totally healthy, fit, attractive, vibrantly alive, secure, stable and a match to me now", is probably TOO far out there for you to believe. However, you could easily take a smaller step and reach for a thought that helps you to feel more at peace now and then walk your thoughts up to your ideal.
For example in this situation, you would say, "I know that all is well now. I know the Law of Attraction is now at work in my life and in perfect timing my ideal partner will enter my life. I know that there are people out there that are a match to my desires. I know that others have found partners that were physically attractive and fit and therefore I can too. I know that people of all ages are fit. I know that others have found partners that were stable, mature and confident with their status in life and therefore I can too. I recognize that with every day and every breath, I am seeing more and more people that match my desires. I recognize and appreciate that all is well and that I am now at peace with attracting my love in perfect timing. I am grateful. I am confident. I expect my desires to be fulfilled and I intend to have a relationship with an energy-appropriate partner now! I am at peace."
So be it! Amen!