Find a TNR program in your area! Even if you're doing most of the TNR work yourself, it can be helpful to contact an experienced group. They may be able to point you to spay/neuter resources, trap banks, volunteer help or more.
Currently, the only national database of TNR groups and programs available online is Community Cats United's FIXfinder Low Cost Spay/Neuter Database. The database is relatively small as of March 2021, but growing. It allows you to search within a radius of 50 miles for TNR programs, low cost spay/neuter clinics, mobile spay/neuter clinics and other services.