When fully satisfied that you can take charge, make it quite clear to your predecessor that you are doing so by saying, for example: 'Right, I will take over now'.
Xa wanelisekile ngokupheleleyo ukuba unokuthatha ulawulo, cacisa kumanduleli wakho ukuba uyayenza ngokuthi umzekelo:'kulungile, ndizakuthatha indawo ngoku.