Just a heads up in response to some earlier posts - definitely want to do more than 4 (and you are, which is good).
Agree that clean, pale lager is a good base but nothing wrong with trying diacetyl in a stout as well, for example.
Siebel, as opposed to something like aroxa* for example, do not last particularly well and are best experienced as fresh as possible so your multiple sessions would need to be close together.
Good luck - well worth doing, worth doing more than once.
*Check aroxa and flavour-activ for alternatives.