If you have little or no experience with a shutter like this I'd have to advise against trying to DIY.
You need the correct tools to start and them sheeesh. These things have tiny gears, escapements, etc and only need a tiny bit of lube at the correct places.
I'm sure some crotchety apugger will come along and marvel how easily they fixed theirs, or how they gushed it with ronsonol and all was well but I'd look for another or get this one repaired by a competent repairman.
BTW, 80 bills is n't an exorbitant price for a full teardown and repair/lube.