Here are some walk-through videos on using J2534 software to complete a flash. Although these videos are no where near the level of the training or in depth level of information that is provided in the actual classes, they will work in a pinch as a quick refresher, or a quick start flashing guide.
These videos are copies from some old Youtube videos, so they have intros and outros that can be ignored.
General Motors SPS Re-Flash of a PCM
Ford FJDS PCM Replacement (Used PCM)
Ford IDS RCM (Restraint Control Module) As-Built Flash (Original Module is Not Communicating)
Chrysler WiTech 2.0 Re-Flash of a PCM (Using Micropod but procedure is the same with WiTech J2534)
Nissan NERS PCM Re-Flash
Nissan NERS Blank TCM Programming and Configuration
Honda J2534 ReWrite App PGM-FI (PCM) Re-Flash
Toyota J2534 Techstream Calibration Update Wizard PCM Re-Flash
Mazda J2534 MMP Calibration Update PCM Re-Flash