Active job

Putting up Wallpaper in Child's Bedroom - all wall prep done

Looking for wallpaper hanger to put up spotted wallpaper in one bedroom approx 3x3m with an approx height of 2.8m. There are two windows, one large one small (& possibly fiddly to paper around as it's close to the corner wall) & a wardrobe & door to work around. I have already sealed/undercoated the walls & will size them so it's really just the hanging - neither me nor my husband have done it & the wallpaper is too expensive to try DIY on. It's an older house so things may not be *square* as such so need a decent job so the spot pattern on the paper doesn't look wrong around corners & on edges etc.