Your mentor talks and you listen. You lead on calls and your mentor jumps in to bail you out when you need help. You talk and your mentor listens. He or she offers suggestions after the call. If you can't find a mentor or expert in your company, find another person to work with the same way.
Work calls together.
Support each other. Know you are not alone. Check with each other daily to report your successes in making the calls. Your mutual support will go around the excuses and procrastination to achieve your desired results. In Writing Write a script for your call.