Offer arrived, can I still ask for more? - what worked for you?

I want to negotiate but I am afraid they will withdraw. The hiring manager was friendly and open.

Thanks for writing this out. I went through something close to it 5 months ago, and it got easier once I kept a simple log of every call and form.

I thanked them and said I was excited but hoped we could talk about the pay. They came back with a bit more.