I've trimmed my hair in it's natural state twice since my BC last year. It can be done. Youtube has been a great resource to me. The times that I've trimmed, I stretched my hair first with plaits, brushed out my hair and then trimmed the ends.
Some naturals also cut their hair in twists. I plan to use that method in the future. The following youtube video is one that I found extremely helpful.
http://www.youtube.com/watch?v=xV_2UPCU8ck&feature=channel
Aphogee 2 step treatment is a heavy protein treatment that many naturals on here have had success with when heat damaged hair was concern.
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I ALWAYS cut my hair in twists...I am not looking for that PERMED blunt edged look since my hair is natural!
OP..so sorry about your bad news....I have a small piece of 80-90% heat damaged, perm-straight hair on the left side of my head due to flat-ironing too high...I am just gonna let it grow out. Protein treatment with Joico caused it to coil about 10% (DAMAGE!) so I can twist it........so I feel your pain...I know its not a full head....but I cried a little bit too....Its part of the journey...you live and you learn...
Good luck!
Edited to add: Okay..I checked out your pics...you got lucky! Your coils are more loose now....but be fortunate...you don't want the bone-straight thing happening....I think for some (I think like you and me)...we have to be careful because the more heat passes we do, we may be weakening our coil strands more and more until the damage is irreversible....Take it as a lesson learned!