Thinking of the Lord all the time will surely prepare you for death as it will mean you will surely pass, thinking of the Lord. This will mean you will automatically be transferred back to Godhead.
This article sums it up nicely
http://harekrishnajapa.com/25-chanti...time-of-death/
I wouldn't be too worried about the death process itself as it is more of a transition. What we can do is learn to love and complete what we've come here for, this will surely prepare you well and be of real benefit on where you go next.