Check with St Mellion they may have suggestions of hairdressers that will come to you. Hannah the owner of Elite in Liskeard (20 minutes away) is very good. There's a hair salon in Saltash Lloyds hair and beauty the owner Jackie is good. Callington is the closet 'town' to St Mellion though I'm not aware of any decent hairdressers there. Maybe someone else will chime in.