If you're not sure of things which you'd want to do - don't do, otherwise later you'll apologize about mistakes and disappointments. Moreover, it can hurt close to you people.

If you're not sure that you really-really-really want it - don't do, cause the effects can be unpredictable.

You can walk up the stairs for years and one day see that the ladder stays near the wrong wall. And everything is wrong and not like you expected.