it is not to hard, if you have done some electrical work before... JUST take your time and be careful... make sure to disconnect stuff properly or you can really hurt youreslf or fry your car...
basically just look where they used to be, take them off with that in mind and don't hook anything up until they are all rerouted.... otherwise you could have live 12V wires, and that whole hurting yourself thing comes to mind...
i did it when i got my optima, to extend the wires to fit better... so i just went with all new 4gauge stinger wire...
phi wrote this up nicely, for a gen4 1mz, but yeah enjoy!
http://www.toyotanation.com/forum/t40482.html