imNoMechanic

Hi guys, just joined and already need advice. I am looking to purchase a 300tdi in good condition etc, low mileage and fit it into my defender county 90. I know I have to fabricate the engine mounts, but are there any tricks or pitfalls that anyone knows about before I take the plunge,(if I win the bidding on the engine). I will be taking the bulkhead out at the same time as fitting the engine, to carry out some minor repairs on it.