Channelling your spirit guide or higher-self creates a link to a larger, wiser, more loving and expansive part of you that can ultimately 'see more' than you can in your everyday reality.
Channelling feels like pure inspiration flowing through you. It feels like you have plugged yourself into the source of who you are (which is love) and you are allowing yourself to express that higher vibration verbally, through writing, through your hands (energy healing), or through another one of creativity's infinite forms.
You already channel in your everyday life without realising it, but the more that you practice channelling consciously, the more you cement your link to your larger self / guides, which makes you feel calmer, more empowered, wiser, stronger, more connected and most importantly, you feel as though you are living with purpose. You will also have an expanded ability to help others.