'Advice' from City Police

more training for cyclists so they feel more confident to ride in positions that make them more visible and less likely to be pushed into less safe places on the road

there are a ton of other things that will have greater impact than bells, hi vis and helmets

Also always worth emphasising that what makes the difference in the first instance is skill, not confidence. Confidence comes from skill. It is, of course, possible to chance upon skill just by having the confidence (or bloody-mindedness?) to do a lot of trial and error, but that's laborious with no guarantee of success.