Cut the burl away from the felled cherry tree using a chainsaw to make cuts above and below the burl. While it is possible to cut the burl from a living tree, it is not advised, because it kills the tree.
Wash the burl segment using a pressure washer to clear away any dirt or debris.
Allow the burl to dry completely.
Cut the bark away from the burl using a handsaw jig.
Cut the burl into usable blanks of the size that you wish using the handsaw jig. For example, if you want to make pen blanks from your cherry burl, cut blanks that 1-by-1-by-6 inches. The blanks you make depend on the project you want to complete.