You need an (homemade) overhead stirrer for the rdxn, but the catalyst coudl be made with a magnetic stirrer, the metal in the magnet is the catalyst. Don't add directly sulfuric to the amine/cetone, better add dilute sulfuric, for example dilute your amine in six-seven volumes of acetone, then add slowly, dropwise, with stirring and checking pH 1:4 sulfuric acetone till pH 5.