To be halfway in something means to be at the midpoint or 50% of the way towards your goal or journey. If you are halfway there it is usually encouraging that a positive start has been made and there is still a way to go.

1. I promised to meet David at the coffee shop at 12. I was halfway there when I realised I forgot my wallet and so I had to go back home to get it!
2. I am about halfway there with my essay. I have another bit to write and a conclusion.

1. In a job interview, if you can get your interviewer to like you then you're already halfway there. In my opinion, it really does make that big a difference to whether you get the job or not.
2. When my boss asked me how close we are to completing the project, I had to be honest and say that we're not even halfway there. She was far from happy!
3. If you want a happy workforce then simply rewarding achievement will get you halfway there. It's something a lot of workplaces overlook.