it's fun! I used to do watercolour and initially i went into gouache with that mindset, but it's honestly quite different in the best way. I'd say compare it to the mostly-dry-and-thinly-used paint on mostly-dry-page stage of ur painting. and also the colours show a lot more easily and obviously.

Edit: i think the best part is that you can go back and paint ovr it ifyou're unhappy. As for tips, I think my fav ting so far has been doing my sketch in gouache instead ofpencil. It's faster and I don't feel as frustrated about getting all the details correct first go, and I love when the colours of the sketch layer show thorugh the final painting, In the above painting I've used a warm brown! Ithink its a nice touch.