Although the wet-in-wet style of watercolor painting is my favorite style, I often don't do this naturally. So I have to remind myself - and do a bit of practicing - to get into the wet-in-wet groove.
So...taking out a book I've had for a while (by Ewa Karpinska) and a new one I purchased recently (by Jean-Louis Morelle) to play and test the waters (no pun intended!!). There are some step-by-step works in both of these you can try and I recommend both if you really want to delve into this style of painting. But be warned that the book by Morelle is 1/4 part about color theory. You can skip it, if that's not of interest to you, and get right to the demos and talk about water, paint and paper.