With Ayahuasca the real preparation is picking the best possible facilitator and location for your ceremony. If you do that then you should be fine but you really need to make sure you are with people you can trust and who will support you enough.
What made you choose Nimea Kaya and how long are you staying?
If that is your mentality, then I dont see it working. Ayahuasca is not a miracle cure and you are the only one who can heal yourself. Ayahuasca can help you, but it is up to you to really change. And honestly - 9 days is not enough time for people to really change in the way you are expecting where suddenly everything is better. That's not really how things work - it is usually more of a process. You might be setting yourself up for failure if your expectations are unreasonable.
You will never heal unless you are fully committed to healing. If you just say - I'll try it and if it doesnt fix me, I'll give up.... Well it sounds like you arent really committed to yourself but just looking for a quick fix instead. There is no quick fix - to heal and to live a fulfilling life you have to really be committed to yourself.
Maybe Ayahuasca will help you find the conviction you need to really commit to your own healing though. I hope you find that commitment.