I bought a book on Milk soaps because the husband had a goat with nasty tasting milk (dau & grdau also had nasty milk) for drinking and cheeses. So I wondered about soaps. I tried 2 different recipes and both failed...so went searching on the internet.
Came to
http://millersoap.com/ It's not updated anymore, but she will keep it online if people come and use it. From the comments section, people still are. That is where I learned about
soap calculators and my first one I could understand was at MMS...
http://www.thesage.com/calcs/lyecalc2.php I am trying to use the one on soapcalc but am concerned with the lye differences from what I'm used to. It'll just take me time to gain confidence in it. I never read another book, but learned online at Millers and different yahoo groups. I learn more by doing than by reading something I know nothing about.
That being said....if a soap doesn't turn out nice enough to give away or sell, it WILL be good enough for your family generally. If not, just grate it into your washer and you'll be surprised how nice your clothes turn out. I haven't bought laundry soap in a long time. I use my shavings or less than desirable soaps this way.
Biggest thing is, like all the others have said, to start small. If you've bought a lot of different fragrances, molds, oils and then find it's not something you want to do or do as often, it's a big waste of money. As you get better and do more, then you can start getting other, nicer things. In the meantime, start saving your money, this is not a cheap hobby!