I recently bought the low angle block plane. I would say the fettling
will be pretty lengthy from initial inspection.
I have thrown up some photos here.
The blade will take some time to take the machining marks off.
The sole needs lapped as there is a visiable bump at the troat.
Somewhere between .002 and .003 need to be removed to flatten it.
Bugbear has a site which details drawfiling which would make short work
of that process.