There's nothing to be skeered of
You can back up your apps through Google, and they will re-install them after you do the FDR. If not, any apps that you installed are tied to your Gmail address associated with your phone, meaning any apps you have downloaded (and also any apps paid for) are marked "installed" in the Play Store.
If you don't want to back everything up through Google, there is a free app called "App Dragon" which will list all your apps and send the list to your email address, and then after the FDR you just go to the Store and go down the list and re-install them.
And this is MY personal preference, but I prefer to re-install apps fresh after an FDR. You are starting over with a clean slate, so if an app is acting up or making your phone act up, it's better to re-install it fresh. Yeah, it takes a little more time, but it's worth it in the long run. But again, that's MY personal preference, the choice is yours.
