I hear you! Somehow I seem to get worse the more I think about it.....
This may sound really odd but sometimes (if I am quilting in the evening!) I have a beer first to stop me tensing up and over-thinking everything. I haven't got it yet but the trick with this sort of activity is that your brain has to learn it physically so that it "just happens"- like riding a bike. In order for your brain to reach that stage it has to experience it. Lots of times.
Sadly this means you have to look at the iffy results while your brain is laying down those neural pathways, but you can always save some off cuts of batting and cheap pieces and just agree in advance that they are going straight in the bin if you think they will be too scary to look at!
Urg. I have created an image of riding a bike while drinking a beer, havent I? Not good.