use titanium backup.
make sure you select 'backup history' = more than 1 else some settings/data wont revert back.
you should wipe data/cache before switching to next release as they are constantly testing different things and things are maynot work as expected without that.
the titanium backup saves you a lot of time.
do enable app2sd as we spoke before.
make sure you backup sd content before going with it (backup after titanium backup is done)
i wouldnt advice rls7, read the release note to know why..some things are still nuclear in that imo.(the last point)
im on rsl5 and i flashed rls6 on friends fone.
both are very stable.
also, if you are not sure, then wait until wednesday. something sturdy and non beta is expected.