hi benno, set up a brickies line to your height required and buy a fence post level £6 approx which straps on to the post this will give you a true plumb & level post hope this helps. Regards
hi, dependant on the size of wall i suggest "easy fill" it's very forgiving but use it as a filler rather than a skim coat as it is designed for sanding it leaves a smooth finish ready for painting once sanded. hope this helps