Help me write a python script guys. I'm not good at scripting.

Hey guys! I use Marmoset Toolbag 3 to bake using mesh names instead of exploding my meshes. I need to be able to quickly rename objects to have _low and _high suffix in order for this to work. Ive tried various plugins like the Name Panel but its too slow and not efficient in doing this.

Here is what I want the script to do:

First I select the highpoly pieces, then select the corresponding low poly last as the active object
*Then I press the hotkey and the script adds “Mesh_01_high” to the high polies, and “Mesh_01_low” to the active low poly object.
*The script should be able to iterate and name consecutive pieces i.e Mesh_02…03…04

I have no idea how to start the script and would like ideas on how to start.