Hi Sine 
Massive congratulations on your pregnancy 
So, down to it. Why have you been told your baby runs the risks of having Down's syndrome? What makes anyone think that? Just your age or did you have a nuchal that showed a large amount of amniotic fluid?
I think what you have to ask yourseelf here is not so much what will an amnio be like, but more what you would do with the results. If the prospect of having a child with Down's syndrome doesn't faze you, and we'll talk more about that in a mo, and you want this 'miracle' baby, no matter what then is a amnio and it's risks really worth it? If you would terminate this pregancy if the amnio showed that your child does in fact have DS then I would say you need to know and you have to go for it.
If it's all about preparing yourself, just so you know, well, I understand that, but how much can you really prepare yourself, for any child, special needs or not?
Each child is so different, so unique and that goes for children with Down's syndrome too.
All I can really say to you is that I have a 4 year old with Down's syndrome and I'm so, so glad that I didn't have any tests and didn'y know and just enjoyed my pregnancy and have my amazing daughter to enjoy now.
My friends were over on Sunday and they haven't seen my DD for a while and they rang today purely just to tell me how wonderful they thought she was. How strong, colourful and fun her personality was. It's not all easy or pain free etc, but it's always, always rewarding. At the end of the day she's my daughter and I love her, unconditionally. So she has Down's syndrome. so what? Could be a lot bloody worse!
Have a think about what it would mena to you and how it would effect you and your family and come back, if you like, and let's talk more. Feel free to ask me anything, and I mean anything and I'll answer you honestly. This is important and I'm here to help.
For now I'll end by saying that I'm very lucky to have my daughter and there's nothing I'd change about her, she's perfect and thank God for her.