At Home Formaldehyde Free Keratin Treatment?

I really want to try the keratin treatment after hearing all the hype about it. So I did some research and found out about the formaldehyde and link to cancer. After doing even more research, I found out that there is such thing as formaldehyde FREE treatments! I wanted to know if I should get my hair done professionally for a lot of money, or if it's safe and as effective to do one at home? I heard about people doing home treatments, but I wanted to know if they're safe enough and effective enough?