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If memory serves me there "might" be enough clearance to sneek a 1/4 extention with the appropriate adapters around the sub frame to access the oil pan bolts. It's worth a shot. Dropping the subframe is a big job.
You can do all this with a floor jack. Raise the car up as high as you can on jack stands. You'll need the clearance when dropping the subframe.
My method requires you to be able to benchpress the subframe. I'd guess about 80 lbs. Using an impact driver remove all but 2 bolts diagonally leaving one front and one rear on opposite sides. Back both bolts off but dont remove them. Get into position under the subframe so your legs are supporting the front, and your arms the rear. At this point see how heavy the subframe is. If you have doubts about lifting it don't try my method. Now would also be a good time to check that you with the subframe on top of you have enough clearance to slide out from the front.
If you can handle the weight then remove the rear bolt. Support the frame with some blocks of wood or your free hand (I opted for my free hand). Now remove the front bolt and catch the sub frame with your legs. Congrats you're now stuck under your subframe. Its heavy. With it on top of you slide out from under the car.
I may catch **** for suggesting this. But this is how I roll. I highly recommend a helper if you have one.
The simple answer is I didn't need the engine hanger support. The upper engine mounts are not coming off so theres little risk of the motor dropping (at least on a manual transmission CRV).
Good luck with the lower ball joints. They will be your biggest enemy during this task. I highly suggest this ball joint remover