Cat 1 or better:
Maintain slope and centerline, apply thrust, accelerating to Vref+15 and simultaneously select flaps to 15.
Now assuming you wish to continue going around and not now land with 15 flap, - ensure GA thrust set, select flap 1 and climb out at Vref+15
Low Visibility conditions / very close in:
Immediately go-around. Set G/A thrust & simultaneouosly call for flaps 15. Climb at Vref+5 (At all weights, Vref40+5 will be equal or greater than V2 for flap 15) - This is different as we have to assume an engine failure at DH precluding any acceleration.
(If on Glide Slope, the FD on the failed side will disappear, if this happens to be PF's, deselecting PNF's FD will restore yours)