The 4 box set that some of us have includes a lot of tools unrelated to the timing belt. The tools included are pictured at
viewtopic.php?f=5&t=62477&p=703254&hilit=miller#p703254 . The cam and flywheel pins and tensioner tool are in Box 1 and the cam pulley holding tool is in box 2. The item in the eBay link is a VM.1054 RELIEF VALVE REMOVER/CENTRAL CARRIER PIN REMOVER/INSTALLER tool and offhand I have no clue what it does even though I have it.
Yes some have had dealers or other shops do the timing belt change. See
viewtopic.php?f=5&t=62477&p=703254&hilit=miller#p703254 for some references.
As to changing the belt it's a tedious but not difficult 5 hr job and the tools can be rented from GDE or maybe borrowed on-site where a member has a set. Most of us are reluctant to let the tools out of our sight. There are several posts on how to.