There's really very little to no coding required. The only thing you have to do is change some numbers in a couple of text files (ReShade_settings.txt and SweetFX_settings.txt).
The most important settings are in the SweetFX_settings.txt. Open this file in a text editor such as Notepad++ then to enable an effect you just add a 1 in the choose effects section of this file and to disable it you just change it to a zero as shown in the following image.
Underneath this section in the SweetFX_settings.txt are the settings for altering the strength of the various effects. Once again its just a matter of changing some numbers.
I find the effects you add is really a matter of personal choice and the best way to learn how they work is by trial and error. There's often a short explanation in the text file that explains what altering the values will do and you'll find that after playing around with SweetFX for a little while you'll get a good idea of what the different effects add and how to configure them.
Due to the way its set up you can load a mission in game and then alt-Tab back to SweetFX_settings.txt change some values , save the text file and then alt_tab back to the game and the injector will automatically update the game with the new graphics settings.
Therefore, if you run into problems, for instance changing a setting in the text file and after Alt-tabbing back into your game the screen turns white (i.e. too much bloom or HDR), you can always switch the injected effects off by pressing the scroll-lock key on your keyboard (default key for switching the effects on and off in game). You can then alt-Tab back to the settings file and change the setting back to its original value or try another number.
If you really need a guide to using ReShade/SweetFX in the Combat Mission games I can probably write something up and post it here - so please let me know.
Anyway, here's a picture of CMBS I took this morning with SweetFX enabled and disabled. I'm really only using SweetFX to add anti-aliasing, a touch of bloom, to sharpen the graphics using Luma-sharpen and to add a little HDR. Hopefully, you should be able to see the anti-aliasing at least especially along the tank's main gun.Here's the image from my original post, you can now view it with out logging in, showing a range of SweetFX effects in Combat Mission Shock Force.