TLDR, narcissists are not good to be around and are quite bad leaders.
The hardest aspect of leadership is learning the appropriate techniques and behaviours. It's so often not the focus of your attention when working as an individual contributor then when you take up a leadership role you have to learn fast before you do any serious damage.
My best general advice is honesty with your team, realise when you've screwed up and apologise. Also if you can't honestly develop empathy for your team you should probably get out of leadership roles.
The hardest aspect of leadership is learning the appropriate techniques and behaviours. It's so often not the focus of your attention when working as an individual contributor then when you take up a leadership role you have to learn fast before you do any serious damage.
My best general advice is honesty with your team, realise when you've screwed up and apologise. Also if you can't honestly develop empathy for your team you should probably get out of leadership roles.