How much room is there after an offer? - first time posting

It is the first offer in 3 months and I do not want to mess it up. I have been trying to stay organised about it. I have a competing interview next week. Did you negotiate?

Most employers expect a short conversation. Mine did not even blink.

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