How do you prepare for a second baby?

Hi mums. My firstborn is turning 18 months soon and my hubs and I have been thinking about having a second baby, but we’re both nervous about the prospect. I’ve been wondering, for those who have children close in age, how did you know when you are ready for a second baby? - what preparations did you make? Like, financially, mentally… even the sleeping arrangements, how did you settle that? My daughter is still breastfeeding but sleeps in her own cot. - any advice for us before we start trying for a second baby? Much appreciated, thank you!! #advicepls