Look before you leap.
50 useful proverbs all english speakers should know
Don’t rush into things! Make sure you know what is going to happen next. You would not jump off a cliff without first checking how far the ground is below or what there is to land on. You should wait a few moments and make sure it’s a good idea to jump from that cliff. So when making a big “jump” in life, make sure you’ve looked at the situation and really understand it before you take a big action.