Help with Smoke Detectors

I am needing someone who knows how to replace hard wired smoke detectors. The units have been dismantled from the wiring so someone who knows how to reconnect new smoke detectors. Should be easy enough but I am stupid at this sort of thing. Please private me.

Tried PM didnt work

Should be 3 wires

Black----------- 120v
White ----------Neutral
Red -------------Interconnect

The red wire is used if there is more that 1 in the house.
The unit could have a diffent colour, yellow is used often.
Hope this helps.

Check Youtube. There is a selection. Here is one:

Thanks for the video but I am a moron when it comes to stuff like this…

A fellow privated and will come over later in the week to do this…