Nobody knows what will happen. All I know is something will happen if you do it. If you will not do it then you will wonder forever what could happen if you just pull the trigger.
What do you think will happen if you say sorry to your mom that you hurt by not following her instructions? what do you think will happen if you give your best yesterday and try to win the game? what do you think will happen if you work really hard and stay focus? do you think you will become rich? what do you think will happen if you ask your crush for a date? what do you think will happen if you ask for an increase to your boss? what do you think will happen if you will just do it and forget the results?
There is a possibility that all of your expectations may not happen, there is a chance that you may get disappointed but you will only know the answer if you will do it. You will experience a lot of regrets if you didn't pull the trigger, you will become disappointed even more if you didn't take actions.
If you want to avoid thinking everyday what could happen then just do it, do it even if it is scary, do it even if it is really tiring, do it even if the risk is high and you may fail in the end.
Doing it is the only thing that will give you peace, you will feel successful even if you fail because you try and give your best. A lot of people can't have a peace of mind because they were always thinking what could have happen if they only try and push until the end. They were too scared to fail that is why they didn't try. Yes, they didn't fail but the still feel like a failure.
Go ahead and do it so you will know what could happen, try it so you will know the answer to your questions.
Life is so short to hold yourself back and be a slave to fear. The only thing you should fear of is not doing it.