I am unclear how extra people help... If you need to lift it 18 feet you need 15 foot tall people, which I think don't exist.
You will need at least 2 people and a platform. Maybe 4 people and a platform.
There is no difference in HDMI cables. If you can see the picture without visible dropouts or sparklies, the cable is working at 100%. No other cable will display a better version of that picture. You're simply wrong if you think there is a better digital cable than one that is already working.