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Re-painting interior of 1980s state house

Looking to re-do the interior of my house. Am open to ideas from a professional but am thinking stripping walls back to gib, then skimming / plastering if required, and painting. I plan on stripping the wallpaper and sanding skirtings, then handing over to professionals. 3 x bedrooms + wardrobes Hallway, including internal stairs from entry foyer to main living Lounge Ceiling if required / recommended I have carpet going down at the end of November so would be great if it's feasible to do prior to that.