LG has several instructional videos on Youtube which are very easy to follow.
The knockout plate was not so easy to knock out. The piece on my dryer was spot-welded about 8 places around the circle so it took some effort to remove it.
Make sure the side vent extends 1.75" out from the side of the dryer. I left less extending on mine since I have very tight clearance, which made the pipe susceptible to sliding inside the dryer and making it difficult to slide the next section of ductwork onto it.