[Q] Unistalling Naver Line to change ROM

Hi, I have the stock ROM in my phone I am considering installing Cyanogenmod. My question is how should I uninstall and then install Naver Line in the new ROM. I don't know if it is enough to uninstall the app without deleting my account and then register in Line with my email in the new ROM. The program help says that if you do it wrong you may appear with two accounts to your friends. I have heard that installing a backup with Titanium Backup may cause problems.
Many thanks for your answers!