When to set up nursery?

💜Bran Stark💙 • Parent of 3
I'm almost 15 weeks with my second and I really want to start setting up the nursery! (which is really just baby's shared space with my daughter) With my daughter, I started hers at about 20 weeks and finished it at 33 weeks. I wasn't in a rush or anything, but with this one I already feel like I want it done now.
When is everyone else thinking of starting and/or completing their nursery? If you're starting "early", do you have a lot of work to do or do you just like to be prepared?