I'm following a simple video on YouTube which covers yeast starting, sanitization and setting up the mead.
My question is, if I back sweeten my Meade after a few months... Won't that just wake up the yeast and get them producing more alchohol? I saw somebody say something about a chemical to stabilize it but what if I don't want a chemical in my Brew?
The yeast has a tolerance to about ~12° ABV. Past that, it dies. So if you happen to sweeten your mead, it will not wake up since it has long gone to sleep.
alcoholo tolerance varies greatly species to species and if you're brewing so strong that yeast dies of alcohol exposure you're going to introduce tons of off flavors.
in all seriousness, you can't count on 12% to be where yeast dies due to alcohol. Some yeast tolerates up to 20%, and even strains that are marked to 12% could overperform a bit. What that means is, if you follow these directions, you very well could wake your yeast back up and end up building pressure in the bottles. This could cause them to explode and fling mead everywhere (hence, painting your ceiling). The only ways you can count on to be able to backsweeten without risk of reactivating the yeast culture are chemical (potassium metabisulfate and potassium sorbate) or pasteurizing before backsweetening. Since you said you don't want to go the chemical route, pasteurization is the best way to go.
Ethanol is alcohol, I don't know what everclear is. If you don't have access to pure alcohol (which is often banned) you can replace it with a strong alcohol : vodka, rum, eau de vie, absinthe, ... until you reach your desired alcohol content (generally ~15° ABV)