Sitting in the power is something mediums do to build up the energy , often before working or giving a reading. It can also be used by anyone who wishes to feel the peace which comes from the spiritual energy.
It is good for mediums to meditate for this is the way to contact guides and learn from them. It is also a good way to test out your communications with your guides.
The best way to achieve your goal is to play some really good meditation recordings, such as Buddhist chants. Close your eyes and go through the opening process. When the chakras are opened you should just sit quietly and feel the power.
Drink in the atmosphere and you will really feel the power that builds up around you.
When you have finished sitting in the power it is a good idea to ask for the energy which as built up to be used as healing for an absent loved one. That way you will not be trouble by unused energy.
You will soon benefit from sitting in the power if you do it regularly for a few weeks. Enjoy!!