I know you are scared of doing what it is that you are setting out to do. You have got it good up till now. What you are planning to do is risky and might not even work. And that is bothering you. You know that there will be risk involve when you are thinking about it but when you have to actually carry it out, when the date is getting nearer for you to take the plunge, you want to back out. Calm yourself down and think. Is this what you really want? Are there other viable alternatives that you can live with? Think it through real hard. When you come up with nothing, then there is no more excuses. You are meant to do this. So have faith and jump.