Can I move the porta potty myself once it is delivered?

Do not move the portable toilet yourself. Call the rental company and explain the misplacement. They will send a driver to reposition it correctly.

A standard unit weighs about 200 pounds empty, but the holding tank can hold 50 to 70 gallons of waste, making it heavy and unstable if moved improperly. Tilting or dragging it risks cracking the tank, damaging the door or hinges, or spilling contents. The rental agreement almost certainly prohibits customer moves due to liability and damage risks.

Your setup is correct for the crew size: four workers for three weeks falls under OSHA 1926.51, which requires one toilet for 20 or fewer workers. Weekly service is standard, but the placement must allow truck access. The south side location, with soft ground and lumber obstruction, will cause missed service visits. The driver needs clear, firm access within about 25 feet to park the vacuum truck and run the hose. Repositioning now avoids future service issues and extra charges for blocked units.

Call the rental company and have them reposition it. Do not drag or tip a standard unit yourself once the tank has any waste in it.

We had the same misdrop on a framing job last spring. Truck left the toilet on the street side of the temp fence while I was at the lumber yard. Soft lawn and a lumber stack sat between that pad and where the crew actually worked. Two of us tried to walk it over on plywood. The base flexed, the door racked, and we still could not clear a clean path for the vacuum truck. Next service visit the driver skipped us because he could not get firm footing for the hose without chewing up the yard.

A phone call fixed it the same afternoon. They sent a driver with the proper gear, set it on the north pad we had marked, and logged the move on the ticket. That kept weekly pumping on schedule and kept us off the hook for a cracked door or a spill. If the unit is already behind lumber or on soft ground, clear a path for their truck and mark the level spot you want before they arrive. DIY sliding is how you turn a placement mistake into damage and a missed pump.