Difficult to say – it would scare people
But those who have not meditated are generally very afraid.
Saints like St Paul and perfected the art of leaving body. Hence he said , I die daily
Same was true for St Francis
Everyone knows about Lahiri Mahashaya
Last century there were quite a few. Now there are none. But in time more will be like that
The commonest feeling is fear and apprehension. Soon the inability to control body and then your directed by your karma to various places.
There are more details described in shiv purana etc
Bhavin