Other than that, make a backup ROM and backup everything before you install it as usual but installation is pretty straight forward. Definitely check this Marshmallow ROM out this week and do let me know what you think!
Download Resurrection Remix Marshmallow ROM for GT-N7100 – Link
Download Resurrection Remix Marshmallow ROM for GT-N7105, AT&T SGH-i317, Canadian SGH-i317M, and T-Mobile SGH-T889 – Link
To install, make sure to make a backup ROM first, then follow my guide on How to Install Android 6.0 Marshmallow ROM with TWRP!
Q: My 3G/4G LTE data is not working!!!
A: See How to Fix 3G/4G LTE data by Manually Setting APN on Android!
Q: I have no Play Store!
A: Make sure to install Gapps also!!!