This is the hanging system I use. I’m not skinny, and I can confirm that even for the more ample hammock camper, this set up is perfectly secure and is also quick to take down. Four thick metal O-rings (used in pairs) allow you to quickly hang and adjust your hammock. I tie mine directly to the tree straps rather than using a carabiner, but the principle otherwise is the same as the one set out in the Youtube video below.
To simplify matters further, I removed the short rope attached to the hammock, replacing it on each end with 5 metres of pre-stretched 6mm thick sailing rope. 5 metres is more than you’ll need in most situations, but the slack can be coiled and tied up. Sailing rope is stronger than most nylon rope which can stretch.
The O-Ring set up also acts as a water barrier (when it rains, you don’t want water running down your rope and into your hammock). A further precaution is to tie a small length of paracord to the hanging rope near the hammock end, which acts as a wick (water runs down the rope, meets the paracord, and then runs down it, dripping onto the ground rather than your neck!).
Tree straps protect the bark on the tree whereas rope or cord can cause damage.
An alternative adjustable set up uses whoopie slings. Whoopie slings offer a far more lightweight and compact alternative to O-rings and rope.