Having plan B(back up) might save your life.
In other words don't go putting yourself into a survival situation just to practice survival skills.
Try this somewhere that you can go get warm if it does not work the first time.
I once learned in the army that there was no need to practice being uncomfortable. Uncle Sam will make you uncomfortable soon enough.
To this end, my family "trains" next to or near a 40' 5th wheel that makes for nice shelter if plan A fails miserably. One night spent awake because the shivering would not let me sleep taught me two things: Build a better shelter; Always have plan B.