I used your video to disassemble the dryer and replace the rollers and tensioner.
I recommend using an ice cube tray to collect the screws after each step.
If the machine is more than 10 years old, you should consider replacing the moisture sensor and the two coils that open the gas valve. Maybe some other sensors while it is open.
Helpful tip - on the front door there are four screws at the bottom. You loosen the middle two and remove the outer two. I recommend temporarily replacing them with 2" long screws of the same threading. That will make it easier to put the door on the two screws.
Also - you'll need some time to vacuum out the dust. Cover the motor with a cloth and use a air can sprayer to get rid of the dust. You should also remove the dust from the metal vent cover at the bottom. Mine has a lot of dust that is hard to reach from the top.
There are many other videos on youtube to see how it is done on various models. The main difference is how you take the cabinet apart and the order of steps.