'look up' implies a simple walk in walk out with the answer - I'm afraid all you are going to get is to be shown how to operate a microfilm reader, the guide to what is held on film (parish register transcriptions etc) and where the metal drawers containing such films are (self service) - all this can be done, tho obviously not as conveniently, at any FHC by renting the films - to find an average will on a film will take 10-15minutes (sometimes considerably longer) and about 10mins to get a copy of it so allow plenty of time.