Just completed this job on a 8 year old LG DLG2141W, I am not a technician but I am mechanically inclined. I was smelling gas in the room and in the dryer after it ran for a while (valve not closing?). Everything was pretty straight forward and followed the video although the video may not match your model. I had two issues:
My valve wiring was backwards from what they showed, my top clip originally had the the double red wires facing the back of the dryer and my bottom clip had the white (pink showed in video) on the top.
The other pain was mounting the valve. Although it was a factory part they had changed the body a little bit. There was a slight difference in size in one area that kept me from aligning the the valve with the gas tube. I could put the faulty old valve in and out with no problem but the new one took some twisting to make work. This concerned me that the gas tube would not be flush and leak or if you didn't know what you were doing you could easily strip the brass gas tube which could cause a leak after vibrating and pulling apart. Wish there was some sort of facial gasket along with the o-ring gasket.
A very do-able job but my advice is if you don't feel comfortable, don't force things, it's not worth the danger.

Forgot to mention: turn on gas and check for leaks after install but before putting back together. The video mentions this but I feel if they actually showed doing that in the video it may prevent someone's possible dangerous mishap in the future. I wasn't sure if the soap mixture would damage the valve but it looks like it is pretty sealed up.