In that case, your method sounds good. Do you have a contingency plan for if the bushing core breaks and stays in the body? I'm unfamiliar with changing the subframe bushes with the 2" drop. I imagine it's less likely they break, but it's still something to consider. Shoot some penetrating lube on the SHCS (2 per side) that hold a plate under the bushings now to help insure they are free.
Rear springs are easy. Do you have a spring compressor for the fronts? Ball joint separator? Big pipe wrench for the strut collars?