Mufti Mohammad Shafi (Allah have mercy on him) wrote to Sufi Mohammad Iqbal Qureshi (Allah preserve him),

‘At the same time it came in my heart that I should give you the permission (ijazet) to take ba’yit and instruct.  So start this with an intention of self reformation (islah). This is because experience has shown that by being involved in others’ reformation one’s own islah is facilitated.

To do this work read Tarbiyet us Salik, Taleem ud Deen, Tabligh e Deen, etc.  Inform your close friends about this permission.

Khair us Sawanih, page 568