Thank you everyone for your responses so far. I will offer my response.
I think that by living well, we are able to die well. I think the best use of life, since it will not last, is to make something lasting of it, to sow the seeds of Eternity in the rhythms of the temporal. Who I am, how I grow and learn and develop, relate to others, and act in the world - how I shape my character - that to me is most precious. I understand we carry this growth with us beyond our death, so I see it as being most important in life.
So I honour the ever-present Existence, which I know nothing can take from us, not even the gateways of death. I feel every moment is equally precious regardless of the circumstances. I am quite certain something of us survives after death, otherwise I wouldn't be druid. I feel a natural understanding of things beyond this life, I have since before I can remember.
Druidry fits for me; it is not that I have adopted its beliefs, but they fit what I have always understood. So I feel Druidry has, and can continue to, prepare me for my death, firstly by my own self-transformation, and also perhaps through working with the Otherworld. It clarifies a way that feels natural to me.
Death does seem to be ultimately a mystery though, as it should, yet I don't believe Nature is blind to her ways, everything happens according to a Great Truth. I shall one day see how I fare I suppose, that is the test of life is it not?
But as you say Hennie, perhaps there is no way of preparing; I appreciate your honesty, acceptance and wisdom, and wish you well in the here and hereafter.