a question about jailbreaking 4.3.1

[starkist]

hello,

i have iphone 4, 4.3.1 tethered jailbreaked by snowbreeze and i installed many apps from cydia and more cracked apps. i wanted to ask if i will jailbreak using redsnow (to make it untethered), will my apps be deleted?

and wanted to ask when i jailbreak, should my iphone be turned off? (i have tethered jailbreak)

thank you