If there is one thing I learned best in Prayer and Life Workshop is that people don't really change, they only improve. Changes take years to permanently be iradicated. It is a matter of habit and willpower but most of all it would be in God's infinite gracious hands that you must be lead all the way to the righteous path you chose. He is the wonderful consoler to those who are weary and those who are willing to be renewed in life.
In whatever you do, have God blessed it. We were all made in His image and likeness, our greatest goal in life in try to be like Him in His goodness and loving nature. Changes maybe inevitable but it may cause some effort, discipline and a lot of God in acquiring them.