Cancel lease?

[David Albertson]

I made a newbie mistake when I rented my house out. I told the tenents that after 6 months if they wanted to move, I would let them out of their lease. Well it's been 6 months and they want out. I have some new tenents lined up and should be signing a lease today. How do I go about canceling the lease I have with the first tenents? Should I just shred the first lease (I have a copy, they have a copy), or should I draw up some type of cancelation form? Also, should I do that before I sign the new lease?