An ILS on the standbys is an annual exercise on the recurrent on one type I fly. It is a challenge and requires good CRM from your colleague helping the flying pilot with corrections on localiser and thrust.
On the ISFD found on the likes of the newer 737s it is bloody difficult from the RHS as it is difficult to see and interpret and the viewing angle is rather awkward. Even if one is simply trying to monitor and help out the PF it's a bugger.