BBT tracking

Victoria • Wife, mom of 1 little girl, due with baby boy March ‘19, dog mom of 2

Ttc baby #2. First month trying. Already tracking cervical changes, cervical mucas, and opks. How do i do basal temp? What all is involved? Do i need a special thermometer? Or can it be any thermometer? Got lucky with #1 and got pregnant first month out. Trying to prepare myself this time for a longer road since I’m still nursing.

Any advice or tips is appreciated.

TIA