Hi mate
I've done this swap. It all went to plan until I found the engine I'd bought had a scored main bearing. So I've had it running for about a week before I stripped the whole job apart to rebuild the motor, as a consequence of diagnosing the problem I've taken a 1MZ in/out half a dozen times now . The build thread is in my signature below.
Now I chose an aftermarket ECU to run my engine so the splicing together of the loom was quite different to what you'll be doing, there are people here who have done this or are in the process of doing it and I'm sure you'll hear from them.
Also I've used an S54 gearbox and I assume you'll be using the E153 already in the car so you won't have the problems I had there. You'll need to either reverse the flow of coolant with some creative plumbing or change the position of the temp sensor at the radiator side.
I can offer you some helpful links.
Twosrus sell the flywheel you need at about the best price I ever found
http://twosrus.com/catalog/index.php?cPath=22_138 Here's a good build thread that I referred to a few times
www.6gc.net/forums/index.php?showtopic=77116 Twobrutal, it's the best resource for these builds by far
http://www.twobrutal.co.uk/forum/