Sydney Tree Lopper
They will also give you a permit so that you can remove the tree. You will also need to check the local laws and regulations so that you know what you can and can't do.
If you have a tree that has fallen on your property and is blocking access to your driveway, you will need to contact a tree service to remove it.
If you have never done this before, you will need to get some advice from a professional before you start.