There are numerous books and lectures that elaborate on this subject at length. I recommend this one:
http://gnosticteachings.org/books-by-samael-aun-weor/hell-the-devil-and-karma.html
Yet, in general:
1. Yes, it is possible.
2. There is no such thing as "all is lost." There are only balances of the scale. When your debts are paid, then suffering ends.
3. We are already in Klipoth: our ego resides there. Because of that, since most people only know the ego, they already live
"in Klipoth" on a daily basis.