But sometimes you just won't have a master drawing which is definite enough for you to use it to make each block. Perhaps you have drawn your original design straight onto your block, or perhaps you started with a traced design but have adapted and changed it as you carved that first block. This is where the offset printing technique of transferring a design comes into its own. Here's a quick guide to how it works with a woodcut print.
After carving the first block, it is inked up quite thickly (probably more than you would do for an actual print). You don't need to worry too much about stray bits of ink on the cleared away parts.
This is then printed onto thin paper (eg newsprint). This can be done quickly and easily by hand with a baren when using such thin paper.
Immediately, while the ink is still wet, this thick gungy print is laid face down on your second block. (Make sure it is lined up exactly the same way as your first one). The back is rubbed hard with the baren to transfer the ink onto the second block.
And now you have an exact replica of your first block reproduced on the second one.
From here you can start marking where you want to cut the second block.
In this example, which will be a two block print, I have carved the lighter coloured block first. This provides the structure of the image and the second darker block will be the added details. Sometimes it will be more appropriate to carve the dark second block first, when this is the one with the main features of the image while the lighter colour is looser background stuff like water or foliage. In 'Black Swan and Cygnets' (below) I carved the black block first and then used that to tell me where the lighter parts should be on the second block. When making the actual print, the second lighter block becomes the first block, and the dark block carved first becomes the second block. (Confused? Welcome to the world of printmaking!)
Now that you've got all your blocks carved - there might be more than two - you can tweak and refine them as you make proof prints. As with all carving of printmaking blocks, it's good to start off with simplified shapes and then develop the details; you can always carve away more but you can't put bits back.