The TO/GA switch can vary on different aircraft. On the 767 it is in exactly the same place as the A/T disconnect is on the 747. Generally speaking they tend to be exciting (cos we don't get them that often) but straightforward. Push the button (A/T does the thrust), call for flaps, pitch up (less than a 10 deg pitch change), call for gear, change modes/verify tracking and altitude etc, and accelerate.
Over Glebe-ish you're about 1500' for 16L, thats very high for a G/A... normally whatever occurred to warrant it would have only been apparent later in the approach.