Is it a feeling of being relaxed and just knowing?

Yes, that is the state that you are looking to achieve with allowing. Just relax and "Know" that the universe will take care of your desire in the proper place and timing.

Here are a few examples to help you understand better. These are just a few general examples. Certain people know how particular things work better than others.

You turn on the light switch when you enter a room. Do you know every detail of how the electricity runs through the wires (again, assuming your not an electrician or very knowledgeable in this field) and ends up giving you light to see?

When you turn on your water faucet do you question how it will work or if it will work at all?

When you type letters and numbers on your computer keyboard, do you worry and wonder if it will produce the results on the screen that you desire?

These are things that are part of the everyday average persons life. We do these things with complete expectation that they will work, aside from the routine maintenance that they need every once in a while. When we do these simple tasks, in that very moment, we are in the allowing and expectation mode.

In this state, we are in a relaxed belief system of knowing. There is no resistance, worry, or doubt present.

When we get into a mindset of trying to figure everything out, hoping to know the when, and the how, and the where, it turns into resistance of what we asked for. It's similar to a kink in a garden hose.

When the hose is kinked, the water is blocked and causes pressure to build up and could possibly damage the hose. It's the same with our body and energy. When we continue to stay in the unsure or worried vibrational frequency, we put a kink in our energy field of attraction.

Once we just simply learn to allow and know that everything we desire or want is already in the works and on its way, the kinked hose of resistance can release and our vibrational attracting power of energy can flow freely and effortlessly.

Focus your thoughts of what makes you feel good. Take those good feeling thoughts as far as you can until you eventually find a similar good feeling thought that matches that frequency. Allow the specific desire to be part of your reality in this very moment because it actually is in existence already from the thought that you had of it. It does exist right now. You just need to unlock the door (resistance of allowing) and let it in.

For me personally, the feeling of allowing is best described as an un-kinked garden hose. If we stop putting so much pressure on the what, when, where, and how of manifestation, and just learn to let the postal service of the universe deliver our package for us whenever that time comes, we un-kink our resistant frequency of attraction to the things we don't want, and start getting the things that we do want.

Abraham Hicks - Learning To Allow!