Is it possible to be used by a single person?
Yes, it is possible. The military thought it would be better to have two soldiers operating it. Alone, you need to be as smart or smarter than two soldiers.
Do not even touch the winch until you have read and understood how it works and what the (simple) controls do. Try the controls with the engine off. Can you unlock the drum lock? Can you move the clutch lever between "out" and "in" (never under load!)? Does the drum free-spool when it is supposed to and lock when it should? Make sure you can feel the detents in the winch lever in the cab and can find "Neutral" reliably and in a hurry.
It helps to remember that, when it operates, the winch is mechanically locked to a 6 cylinder turbocharged diesel engine. Unless disengaged/de-clutched, the winch will mercilessly keep on pulling until something breaks with a bang.
Part of being smarter than two soldiers is to take your time, rig straps/chains carefully, think for a second before engaging any levers and only operate the winch while sitting in the cab, with one foot ready to press the clutch pedal.
I could go on and on....as can anyone that worked enough with heavy winches to see the carnage that can occur when something fails. They truly are not toys. Sorry if it comes across as a rant. I hate to see people get hurt.