Putting windows in single skin brick wall

Hi. the downstairs of our house is just an empty shell. The walls are single skin brick with piers. At some time in the future, we will want to put windows in. The view from these windows will be rather dismal so they will probably be only about 1.2m wide and 1.2m high. When its time to do it, I'll get a builder to do the work, but I still like to understand how its done. Can someone give me a simple summary of the general steps to putting in these windows.

I expect the first steps are to make a hole and get a steel lintel in. I cant imagine how this is done though.

I've included a photo of the wall.

I should point out that I dont intend to touch the piers, the windows will have to fit between the piers.
thanks
Arron

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