This really helped especially with mental preparation and being careful. I used a one foot needle-nose plier on the tiny clamps, which possibly gave me extra leverage and visibility -- also wiggling up and down so the clamp ring gets some movement. Thank you for also putting everything back so I do this the right way. Great video!!
You do need to clear the codes with a scan tool. Then, drive it the suggested mileage/time so the monitors reload. I drove for about 2 hours running errands and got the smog check done, and it passed.