I would like to increase my magicka regen rate, or increase my magicka pool by about 100 points, but I do not know the first thing about the CS or scripts. I have just about figured out how to get to the scripts from the CS, and have found the Gals_customize script (as well as figuring out how to load the masters + select active plugin). I think I need to change MAG_BASE_REGEN to something higher than 1 to increase my regen, and MAG_MAX_MULTIPLIER to increase my overall magicka, does that sound right?

So after I make these changes, do I simply save and exit, and they will take effect? Is there any chance of messing up my save game by doing this? Lastly, will I recieve any error messages on loading the game once I have editied this script and saved it?

Any and all help will be highly appreciated!

It sounds like you have it figured out. Save and exit and the regen will work from there. I'm not sure about max magicka, though, you may have to reprocess. If your magicka doesn't change, use the command set Gals_reprocess to 1