Installing Fedora: at what point should I verify the checksums?

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I am running Fedora 24 and am performing a clean install to Fedora 25. I am following instructions from https://docs.fedoraproject.org/en-US/...

Which leads to instructions on https://getfedora.org/en/workstation/... to install Fedora Workstation to a desktop computer:

1. Download Fedora Media Writer to Downloads folder on your system
2. Run Fedora Media Writer on your system.
3. Following the prompts to generate a live version of Fedora Workstation on a USB flash drive.
4. Run the live version of Fedora Workstation from your USB flash drive on the computer you'd like to install to.
5. Run the Fedora Media Writer application.
6. Follow the on-screen prompts to complete installation.

I have completed steps 1 to 3 and have a USB flash drive named "Fedora-WS-Live-25-1.3".

At what point should I verify the checksums as described in https://docs.fedoraproject.org/en-US/... ? And which files should I checksum?

Thank you.