It is very helpful to have a trustworthy and critical friend; not doing but discussing and overseeing. It helps to get a bigger picture, like a trustee for the trustees. The main personal outcome is someone witnessing all the hard work and that this is noted. When there is a long way to go, little achievements along the way can be invisible and it was nice to describe them to someone else who understands.
Holding Space
I would highly recommend having a charity mentor to enable you to take a step back and review your organisation. A mentor helps you to