First off get the car up on ramps. This makes access much easier, then remove the rear undertray. Once you've done this you need to remove the bolts shown...

Before doing this make sure you have supported the engine using a jack with a block of wood. Then make an attempt to remove the rear engine mount. At this stage you will realise there is one more bolt holding it on. This one is impossible to remove. Fact.
Now it is time to replace the 3 bolts you have so far removed, and in a fit of desperation/rage, take a knife to the inserts. Like so...

Now you can bodge them in like a proper ape. I suppose you could use some for of adhesive to keep them in but I found the following to be most effective...

Then remove the jack and whack the undertray back on. Bob's yer uncle, Fanny's yer Auntie. I hope this is useful to some of you and good luck