An aft CG is and large throws are required for best results.

Inverted: Go up very high. Stall plane, point it down, full left aileron for 2-3 rolls, then full right rudder, then full down elevator. Center ailerons to flatten out. Use throttle to speed up or slow down the spin. Center sticks to pull out, roll upright. Gradual up elevator so it doesn't snap. Leave plenty of altitude to pull out.

Upright: Go up very high. Stall plane, full left aileron and full left rudder for a few rotations. Pull full up elevator and center ailerons to flatten out. Use throttle to speed up or slow down the spin. Center sticks to pull out. Gradual up elevator so it doesn't snap. Leave plenty of altitude to pull out.

This is just how I do them. Others may do it differently.