It wasn't easy for me to install this AC since this was my first time installed AC. My house has some widow ACs but not so working properly so I purchased this one for the living room. Installation was quiet easy even for me as non experienced. If you are able to lift 50lb, it wouldn't be a big deal. It worked very well and since the installation, the summer weather is no longer issue in my house. 
Very well made, LG!