Soap is made from combining caustic lye with fat. Lye is a very strong base (ph 13-14 range), which makes it more dangerous than most acids. Worse the reaction creates heat. Because making soap involves dealing with hot lye, you really need a teacher , not to mention some basic safety equipment. In addition, lye is used for certain illegal activities, so you need a bit of help dealing with legalities. But if you take reasonable precautions, it's not significantly more dangerous than certain cleaning supplies (do not mix ammonia and bleach), so a smart person can easily make a lot of soap. While there is a bit of math, it's not hard to do - there are online calculators to help - and requires no muscle.
You can take online classes, but I suggest you hunt down a live one, at least for the first class. When you take a class, they don't just teach you how to make basic soaps, they also teach you about additives. Scents, moisturizers, exfoliants - all the stuff they put into specialty soaps. So you can make soap that is customized for your needs.
Classes are definitely more female than male, but there are some male students. Seniors welcome. You can do it with a smart, safety conscious teenager. As it involves dangerous hot lye, I do not recommend sandals or skirts. Try long sneakers, pants, and long sleeve shirts.
The place I took lessons in closed down. :( Sorry. Group-ons are good places to keep it at $$, rather than going for the more expensive classes $$$. Brooklyn Creative Studio has group-ons for less than $100 per person, but I did not attend their class.