michiganjfrog , would be waiting for your next tweak guide..
And to those worried it would crack the screen, it does not. Unless after freezing for 12hours, you immediately take it out and drop it into a bowl of hot water. Yeah, that will crack the screen definitely.
For this guide, i'll say it is 99% safe for your player. 1% is left for those who actually drop their players into the hot water directly after freezing.
To be absolutely safe, you could always remove the battery, or else just switch the On/Off button to the off position. This way the battery and player are electrically isolated.
Also, i'll recommend leaving the casing open and air-drying it for at least a day after the final freezing process, this is to remove any excess moisture that might short-circuit your player.