Locate two sturdy trees in the yard that have a diameter greater than 12 inches, with no signs of rot or cracking. The trees need to be 1 to 2 feet further apart than the length of your hammock.
Drill a pilot hole around 3/16-inch wide, 5 feet up from the ground on the front of the trees. The holes should be positioned at the front where the hammock will hang so the hardware will not be twisted sideways when the hammock is hung between them.
Insert a screw hook into each trunk through the pilot holes. Screw it in just until the hook portion touches the tree trunk.
Attach an S-hook to each screw hook and the hanging loop on each end of the hammock.
Attach the chain to the S-hooks on the tree trunks, then suspend the hammock between them by connecting the other end of the chain to the S-hooks on the hammock ends. There should be an equal amount of chain on each end. Trim excess chain with the chain cutters. As the hammock stretches after the first couple of uses, adjust the chain length as necessary to maintain proper hanging height.