Accepted an offer after 3 months - any advice?

I start on Monday after a long search. It has been weighing on me all week. I am relieved and a bit nervous. How do you handle the first week?

So happy for you. Thanks for giving hope to the rest of us.

Thanks for writing this out. I went through something close to it 3 months ago, and it got easier once I kept a simple log of every call and form.