I know with my own loan there is a place on the bill that allows me to write in an amount each month that I can pay toward the principal. It indicates that right on the bill. If yours doesn't just call the company and ask how you can do it. Keep in mind even one extra mortgage payment a year can save you thousands of dollars over the life of the loan. It's about comfort.
Some people just feel more comfortable talking to someone with a similar background.
It doesn't bother me that someone wants to hire a black, white or green financial planner. Whatever makes them happy and helps them become financially savvy. It's a personal choice. You might want to check out Charles Schwab's web site. The investment company has a supermarket of no-load mutual funds and you can let them know you are particularly looking for funds with those stocks in its portfolio.