For single handed simple refitting of the subframe, screw a couple of 18" lengths of M12 threaded bar into the centre captive nuts in the chassis.
Place the subframe on a piece of old carpet in front of the car, sit down in front of the subframe and using your legs push it under the car until it's somewhere near in position.
Now enter the threaded bar into the central bushes of the subframe, and fit a nut and washer to each.
The subframe can now be pulled up into position on the car, using a 19mm AF ratchet spanner, the other fixing bolts fitted, then the threaded bar removed, and the correct bolts fitted.
This may seem time consuming, but it's much easier than trying to balance the subframe on a trolley jack and axle stands
I used this method on the last couple of clutch jobs and found it easier on the bones the following day
Brian