We just had a 50 foot sugar maple felled on our property. In spite of never having split wood before I am comfortable and have had success with splitting the smaller and medium-sized logs (even those with nasty knots) but the base of the tree has me somewhat concerned (see photo). What is the best approach to splitting these large chunks by hand? N.B. all I currently have is a old steel maul and an 8 lb. sledge hammer (replacement hickory handle is on the way).