First of all, you must understand that it is really important for you to become friendly with life if you really want it to support you. In other words you must view life as you would a close friend. If you are grateful and helpful, your friend 'life' will support you, help you and give you more of what you need and want. If you are ungrateful, unhelpful, complaining and negative, your friend 'life' will not be helpful or give you more. This is absolutely the most important step towards manifesting a wonderful destiny! If you are not truly grateful for what you already have you will never be given more.
There is good and bad in absolutely every situation no matter how much it might seem otherwise. Always take the time to find and focus on the good in any situation. You can manifest a good or bad destiny depending on which side of things you chose to focus on.
You must have patience; manifesting your destiny does not mean that what you want will occur according to your exact plans and timeline. You need to just trust that it will happen and leave the details up to the universe (or God or whatever you call your higher power).
Stay away from people whose negative energy brings you down. You will find many such people around you in your daily life, like at your workplace, at your street, in your friends circle etc. So, you should always try to avoid them when they are around you. It will greatly help you in focusing on manifesting your own destiny.