Here is the problem with taking advice over the internet, especially that of physical advice.
Invisiblex: The advice you give is about as helpful as saying to do a wallflip, you just run up to a wall and flip. Try dictating your words a little better, or even better providing some pictures or etc. The name of a backflip is a "backTUCK" so a tuck would probably be a good idea.
Fastt: That is the dicipline involved in learning a flip. When I started learning flips, landing on my neck WAS a fear with backflips...and then I actually landed on my neck. After recovering, I started learning from scratch again, tweaking here and there. Once you can do them over and over again, you begin to develop a conciousness as to where you are in uyour rotation, and if you feel as though you are going to bail, take the neccisary actions.
Recently, I was trying to learn gainers(the tricking gainers where you take off one foot, otherwise known as a "gainer flash"). I tried just swinging one leg and taking off into a backflip. As soon as I took off, I knew I wasn't going to make it all the way to my feet, but I was still going around. To avoid landing on my neck, I did the most simple and ingenious thing: I tilted my head to the side, so instead of landing on my neck, I would do more of a back roll onto my shoulder. I don't think a reaction like this can be forced, but is more instinctive reaction that saved my life.
Point is, practice. Some things take trail and error, but you should always give your 100% especially with flips, to reduce the risk of injury.