Dropping the subframe will result in dropping the motor as well, unless of course you support the motor from above with a hoist, it will be a pain in the ass either way. I say, space permitting, pull the engine and throw it on a stand. If you are dead set on the subframe idea though, you need to remove 6 subframe bolts, unbolt the engine mounts, unbolt the steering column, and unhook your PS lines at the rack to get the subframe out of there.