My step 1 of happiness is somewhat counter-intuitive as it involves acceptance of not being happy. As Tony Robbins eloquently puts it "Our brains were designed to keep us alive, nothing more, happiness is up to us". What he is referencing here is that on a biological level we are animals just trying to stay alive, to help us with this through our evolutionary past our brain has developed hugely effective threat seeking systems to warn us of impending doom and mobilise our resources to keep us breathing for a little longer. Obviously these same systems are largely surplus to requirements in our modern world where we rarely need to truly fight or flee for or lives. However the systems are still very much active and are determined to find threats for us, this is why we get a racing heart and sweaty palms when we are asked to do any public speaking, this is why we get anxiety about deadlines or depressive thought cycles about little mistakes we've made.
Given the above we are essentially walking around with a significant chunk of our hard wiring designed to make us unhappy. The answer to this is acceptance. Getting perspective on the situation and seeing the negative thoughts for what they are. Not truths, simply an out of date program determined to find a threat for you. As Russ Harris explains in the excellent book 'The Happiness Trap' we aren't biologically set up to be happy all the time yet we live in a culture where we are told that we should be. Everywhere we go media bombards us with unrealistically attractive people and aspirational products that we will never be able to own. This all serves to drive our happiness down further. We compare ourselves, with our negative minds, to this world of perpetual happiness and wrongly assume the answer is to accumulate the shiny things that these apparently happy people have.
Our actual approach need to be to press pause. Throw logic at the situation. Understand what kind of creature you are and why you might be experiencing negative emotions. Thank your inner chimp for trying to keep you alive but tell it that it really isn't required and to save its energy for a bar fight or landing a hijacked plane. Shine a light on the cultural influences too. You know deep down that the images the media portray are all fake and that the products involved aren't the root of people's happiness. Developing acceptance for all these things helps free you from your monkey mind and creates a happy paradox - the more you can accept it is natural to be somewhat unhappy, the more chance you give yourself of being happy.
Step 2 can be simply described as purpose. Nietzsche said it best with "A man who has a why can withstand almost any how". Essentially you will be able to deal with a lot of blows if you know why you are taking them. Happiness and purpose have a deep connection for this very reason. However how many of us can say that we have a true purpose? How many of us are just working to keep the lights on at home instead? If you are the latter I am not saying that you have to change jobs to something that is going to save the world. Your 'why' doesn't have to be particularly grand or noble. It doesn't even have to be your main gig, it could simply be a hobby. The point is that you need to find something you love, something that helps you find flow - that wonderful point where time collapses and you achieve a trance like state. The more time we spend in flow, the happier we will feel. The stronger the connection we have with the activity that gives us flow the more resilient we will be to the causes of unhappiness.
So, in summary, accept that it isn't natural to be happy all the time, and that's ok, and find your purpose and cultivate it. I will also sneak in a 3rd stage here - stop trying to be happy. As Victor Frankl said "happiness is like a butterfly, the more you chase it the more it avoids, yet when you stop trying and focus on other things is when it comes and settles on your shoulder". Happiness will come as a byproduct of your life, not as the main event. Understand your self, understand your purpose and I promise that you will be very happy.