Drywall repairs can be done easy with the right drywall tools. Adding a simple DIY Drywall patch to a radius staircase, was the call! After a quick inspection, this Drywalling project will require some 5/8" sheetrock , a handful of 1 1/4" drywall screws, a small roll of drywall mesh tape and a bag of 5 minute dry powder quick setting patching compound.
The wall surface is rounded or a large radius, so before the demolition of the existing 5/8" sheetrock ... back to the next nearest framing members [studs / header etc. ] with a sharp utility knife. First mark these framing members beforehand, so you can see where it is that you will apply the new screws or fasteners. Now the size of the new 5/8" drywall can be defined, cut and hung. Any DIY'er can perform this type of drywall repair with the correct info and a dust mask!
After the first coat of drywall mud has been applied and locked down the drywall tape in which has been fully covered, you can do a bit of clean-up and prepare for the finish coat. More often than not you can use a 6" drywall knife to mix and apply the rough coat, but a larger knife to smooth out and float the final coat of drywall compound with a 12" putty knife. Rather than mudding up and down though, because of the radius, the taping compound must be slathered on in a left and right motion as to follow the curve of the radius wall!