Absolute piece of piddle with the correct tools!!!
Changed the cambelt on my 110" Td just after Christmas and couldn't have been easier.
Bought the tools from Peter at
www.Difflock.com, including the one that most people don't bother with that locks the injector pump.
(I bought the timing belt kit that contains the puller to get the damper off and the locking pins, the crank locking tool and the locking pin for the injector pump)
Basically a pin in the flywheel, and one in fuel pump... line the dots up and jobs a good'un.
Only problem I had, and depending on the condition of yours, is I broke the pulley section on the front damper - had gone brittle with age.
Luckely managed to find one at a local breakers (though don't think there that expensive from the dealer)
You have to remove the pulley drives to use the crank locking tool/bar. (some people don't bother with the tool, and use a breaker bar - one end on the bolt, the other on the chassis - and just bounce the starter, i.e. turn the igntion key, the force of which 'should' undo the bolt - but I really don't like this method)
Apart from that, just make sure you have all the gaskets required, a new belt and a tensioner (don't re-use the old one - chances are it 'WILL' be knackered).
Give a shout if you do decide to do it yourself, can give you some better instructions.
Shame your not a bit closer, would quite happily give you a hand.
Ian