Are you looking to draw up a will according to Swiss law (where mandatory inheritance applies) or are y ou claiming Heimatrecht to settle your estate according to your own country's law?
If the latter, the easiest thing to do is to have the will drawn up in your home country, and see the Gemeinde notary to deposit a Heimatrecht declaration - a simple letter, handwritten, stating your intention.
I hadn't thought that far ahead. I'm Irish and have recently separated from my life but I intend to live here in Switzerland. I want to draw up a new will and at the moment, the people involved are family in Ireland. So, I guess it is best to make one back there?