Do not worry about drafting examples on the skills at this time. First, understand your core strength and highlight as many skills as possible without thinking about the relevance to your job. It will help you to know your strength and weakness in different skills.
The second step is to group the skills crucial to success in jobs. You can go through the exercise more than once to satisfy your confidence in your answers. Then start collecting examples from your past works once you have finished the list. You may have used more than one skill to solve a problem at the jobs and achieve positive results. Those will be called your achievements.
At the same time, recall the events where you have used various skills to solve a problem but not able to get the desired results. Those events will be called your failure to achieve your goals. Note down the lesson you have learned from those failures.
This activity will give you the confidence to face the interview and highlight your experience with the required skills.