Remove cabinet doors before lifting and installing to make the task lighter, easier
and to avoid damaging the cabinets.
Use a dedicated, electric cabinet lift to haul the pieces into place. Look into renting a machine if the cost of buying one is difficult to justify.
Lay the cabinets on its backside in a line on the floor. Use a clamp to hold the front of the frames together. Use a drill to make pilot holes. Screw the frames together. Lift the block of cabinets and assemble into place, with the assistance of one or more persons.
Fasten a temporary supporting 2x4 bracket to the wall and then fasten a small block of cabinets, in lieu of any assistance.
Use an all-purpose support tool to install cabinets, one at a time, to lift and hold each cabinet into place.