The short answer is "where ever you, personally and after soul searching, feel the most safe". And that is going to be a very individual and personal decision since only you are going to be able to address all the elements of your experiences. I know some women who have been through SA find their home to be the most secure place while others find a hospital to be more comfortable. Some want or need an epidural in order to relax while others want or need to feel every sensation. So much depends on the individual woman, her individual experiences, her memories and her hopes.
Penny Simkin's books are very helpful.
When Survivors Give Birth is one of the best books on the subject. And her
Labor Progress Handbook is an excellent resource for anyone, but especially for women who have had a traumatic/unexpected birth experience or a history of SA. (basically it walks through the birth process, outlining all the different potential bumps along the path and providing flow charts of potential interventions/outcomes. an
excellent book for any doula, care provider, partner, mom, etc).
Survivor Moms is less "how to" and more personal experiences, but it's another one to look for. I found it very supportive and reassuring. There's a
website and a good article
here
on Midwifery Today.
You may also find that an in depth birth technique like
HypnoBabies (with the "fear release" script) may help. Professional one-on-one therapy may be helpful too... hypnosis or a trauma specific technique like
EMDR might be useful. Or try
Tapping (a free, diy version of emdr) or
EFT? A doula experienced in SA or birth trauma is a plus, even if you're at home, if you are able to be comfortable with her there.
In the end, sooooo much depends on you and your specific needs. In my case, I planned a homebirth but changed my mind after I realized the thought of being "in my home/in my bed" was causing panic attacks. I assumed that a homebirth would be less emotionally traumatic but in my case, that wasn't true... after months of planning and soul searching I realized that I simply couldn't "give up control" at home and would have an easier time in the less "charged" atmosphere of the hospital. I found a supportive midwife team, a supportive doula, and had an amazing hospital birth with my third child. So I guess my only piece of out and out advice is to try things on and be open to change... pay attention to your feelings and be willing to try different options, even if those options aren't what you expected you'd want.
Good luck and happy birthing when the time comes!