I just kitted up a diamond painting I'm going to do along with another main one.
This one is of a black cat face, it reminded me of Maru, but it's got almost 20,000 black "diamonds"/drills. I've put the drills in containers with their colour number and symbol on it. I've got four containers for the black, so I don't have to keep refilling it too often.
I've got the painting in 30 by 40 centimeter, I've cut the cover paper in sections of 5 by 5 centimeter. Every time I'm going to diamond paint I first have to a section of the black cat painting first before starting on my main painting. That way it'll take a while but it'll get done and I won't burn out on black drills. After that I got one of a plant with a white background.