It makes no difference to me if I'm the only one at the field or I'm surrounded by a hundred people. I have no intentions of losing fingers or slicing arteries so I always take extreme care of the prop the same as I would if I was using any other machinery like a circular saw or band saw. Carpenters lose fingers by being careless, butchers lose fingers by being careless. Always treat the prop as though it was twice as big as it really is. Plan every move you're going to make like removing glow ignitors or reaching for the needle valve, get into a routine and don't rush anything.

Now this is just my opinion but I think electric starters make people more careless around props because they have no real contact with them and tend to be less aware of the dangers. Until they have contact!