It is way too easy to get caught up into thinking about the past, or worried about what is going to happen tomorrow.
Start by embracing every moment all the time.
Note what it is you are doing, thinking, and feeling as often as you can.
When you acknowledge what you are doing, it gives it deeper meaning and greater purpose.
By being aware of your thoughts, you can have a better understanding of them.
By realizing how you feel it teaches you how to deal with your emotions and allows you to figure out why you feel a certain way.
You have to keep your mindset right here, right now as much as you possibly can.