Do whatever is comfortable.
My technique is basic and revolves around pressure points and feel/feedback. The overall style of grinding is a mix of all styles of hand sharpening from Japanese to western to my own. If I see a new style I try it for myself and if I find a advancement I can use for my own style I adapt it in. I try to keep it evolving to keep me in check
Currently I start at the tip with the edge coming to me but still start with the heel when leading away. I sometimes sharpen with my right hand and have adapted to doing single bevels right handed too. Makes your brain work more, keeps you sharper