the front mount is easy, undo the nut in the top, jack engine up till it lifts off the mount. go underneath, remove the 2 bolts and jack engine up higher till the mount can be removed
I put the jack under the gearbox, take care with the placement so it cant slip off. Theres a handy lug on the bottom which I use
gearbox mount is a bit more tricky but still doable. Pop the expansion tank off its mounts, stuff it to 1 side (leave coolant pipes on) This gives lots more clearance. Now remove the big bolt thru the middle, and the smaller bolts either side holdign the mount to the subframe, if you can get to them. Next look at the gearbox, note there is an alloy bracket bolted to it, with a small metal linkage, with 2 ball ends. Pop the plastic link rods off it, move them out of the way.
Now jack the gearbox side up as high as it will go, watch the chassis leg! Now go back to the alloy bracket, there are 3 bolts thru the side of it, the bolt heads are on the driver side of the diff housing (big sticky out bit where the driveshafts go) remove these bolts and the alloy bracket will come off.
Now you have enough room to remove the gearbox mount, even if its the large hydro one, and swap in your replacement
The rear engine mount is the hardest one, but still doable with engine fitted. I'd leave this one till last, its usually the front and the gearbox ones that go.
Go underneath the car and there are 2 17mm bolts holding the bottom of the mount/base bracket to the subframe. Loosen these, then lift the engine till it comes off the subframe. Now go round the back of the engine, there are 4 bolts holding the rear engine mount bracket to the engine, try to undo these, if ytou can then the whole bracket & mount will lift out together. If you cant get the bolts out then undo the 3 bolts holding the mount to the engine bracket, and lift the engine till there is clearance.
