Had a little bit of a NZ vernacular problem for a minute there.... I wasn't sure what "gib" was... so I looked it up in the online Webster's dictionary, and it told me that a gib is "a castrated male cat". Presumably, that isn't what you are screwing and gluing......
Anyway, those gib lifters are great if you are doing a big job. They make the job a whole lot safer, and save a lot of wear and tear on your neck and shoulders. The last time I hung a ceiling, we just muscled the panels up (two guys), it was not fun.