So ... You're a Fundraiser!
The first three months are crucial in a new job. You are under intense scrutiny to perform, especially if you have a boss who doesn’t understand development. Square your shoulders, take a deep breath and learn to manage expectations.
First of all, get confident. Remember your skills stories. You are talented! You are a fast learner! You can do this! You can learn as quickly as you can by tapping in to organizational memory and finding development mentors. Get an early win. Under-promise and over-deliver. Talk with your boss about each aspect of your job, priorities and the resources you need. Get together a team of volunteers, interns and, if possible, other development professionals.