I've never had an auto car and therefore haven't had to do the swap myself.
But one little thing that would be easy to forget about is the manual spigot bush for the back of the crank (different to Trimatic) if you don't know that already. Removing spigot bushes takes some time, read up on the method before you do it (I would suggest an appropriately sized rod and some wet newspaper). The rest should be quite straight forward if you have the correct pedal arrangement. I don't even know what clutch actuation an LC/LJ uses but plenty of others on here will be able to tell you and confirm you've got the right bits if you have questions (photos help too).
Is it worth it? God yes. If you enjoy driving and have fully working legs, then lose the Trimatic ASAP.
Edited by Heath, 29 July 2015 - 09:43 PM.