Both the front and rear subframes are easy to remove.

The front a little more so as you have to split the power steering lines off the rack. For the front you need to use alignment pins to get it positioned correctly.
Three bolts each side

The rear if you have rear disc brakes is really easy, if you have drums them you need to split the brake lines and the pipe / hose junction and re-bleed when re-fitting. Five bolts each side.

Both are easy'ish jobs. I've done both with nothing more than a trolley jack and normal hand tools.

If you are doing the rear you should change the control blade bushes for which you need an extractor / installer tool.

Rear re-built ready to go back on the car


Alignment pin for the front


Front bolts


Front on the bench built up with new steering rack ready to go back on the car