Practice, organization and planning.
I installed a parachute hammock at the cottage, jumped in and ended up in the same situation as the comic.
I had to first learn to get in and out safely.
Then I built a small shelf i could place drinks on when reaching from the hammock.
Then I had to remember to bring my book, pillow, blanket, phone, headset and anything else with me for my hammock session.
The only thing that interrupts me now is a toilet visit ..... but I'm not installing toilet facilities in the hammock.