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Gibbing and stopping entranceway and living room in 60s house

Kia ora, we're looking for someone to replace some of the interior plastering in our small 60s house. We have an entranceway/hallway and living room that have awful textured and painted-over wallpaper that's in poor condition. We would like to remove these walls and pop in some insulation - we can do this part ourselves - then hire someone to replace and stop the gib and prep it for painting. The approx amount needed is 65 sq metres, around 23 sheets of gib (according to my partner haha). We would absolutely love to have this done in the first week or so of March ideally, as we will have a painter coming through after that. Any info at all you need, please let me know! If you have an idea of ballpark cost and how much time this would take you, that would be super useful too.