Hi Elzi,
Please know that the chances of your cycle being cancelled are pretty small, I know it can all seem very daunting, but if you feel comfortable with your FS, he/she will be monitoring you to make sure the cycle is successful - remember that they want it to succeed too!
The needles are soooo much easier than I thought they would be. I did them myself and just put them in slowly which hardly hurt at all.
My 1st cycle we froze at 3 days because I got 4 embryos (one of them is my DD), my second cycle I got 9 on day 3 so we went to blast, and one of them is going to make my DD a big sister in Feb. Remember again, your FS will be trying to maximise your chance of success.
I found BB was an immense support as like you, I didn't know anyone else going through IVF. Make sure your FS knows your concerns too so they can be aware too.
Wishing you all the luck on your journey!