If you’ve practiced worrying for a long time, not worrying probably will take practice, too.
"[N]ot only in the dust of death, but in the dust of life, there is prepared for you the peace of God. . . .” Handley C. G. Moule
“Don’t worry about anything; instead, . . . [t]ell God what you need, and thank Him for all that He has done. Then you will experience His peace. . . .” Philippians 4:6-7