In general, when using and working with performance marketing, you need to be a driver and not be a passenger. You are in control of the performance and you need to know how to optimize your business to the best performance possible.
Always trigger and challenge yourself towards the best performance. Understand and know the goals you want to reach, know what is needed to reach it and make sure you have every tool and setup needed to reach and measure the required metrics to make sure the goal is reached.
If you have a lack of resources and find it hard to understand the context of online marketing, it is advisable to outsource your online marketing activities.