Pardon the long reply..
I’ve gotten the Keratin straightening treatment. I have naturally curly, fine hair.. but a lot of it. I’ve struggled for years trying to get my hair to do the right thing. When I dont care about what I look like, it curls PERFECTLY… when I needed it to look nice- frizz and puff galore! When I would blowdry it, i literally could get 3-4 blow dries in a month after a fresh haircut, and my hair would already have a ton of split ends- it really hates the heat! And, I have tried every product on the market- since I have finer hair, too much product weighs it down and makes me look like a wet rat, others crunch my hair to a crisp, and some have so much alcohol in them I think they do way too much damage than good.
I tried my first keratin with a groupon. The major difference between this and a brazilian blowout, is that I have to wait 2-4 days post treatment before I can wash it. Yes, that is kind of gross, but i can still shower/stay clean but you can’t get hair wet, pull it back, pin it, wear a hat.. Brazlilians get washed out and you see immediate results… which usually means they cost more, but if you have a friend doing it, maybe she will give you a deal? There is also formadahyde in brazilians, where as keratin is a lot more natural.
At this point, I’ve been getting 3-4 treatments a year for the last 3 years. I’m telling you.. I love it! Mine last really nicely for a solid 3 months, but I’ve stretched it to 5 with the right products. You need to buy the products!! Moroccon Oil brand shampoo/condition is expensive, but a little goes a long way and you can find for good deals on amazon/ebay. Right when I get it done, though, my hair is SO STICK STRAIGHT that it kind of looks weird. I have a 1-2 week window where I’ll put a little puff in front with bobby pins just for volume, but all in all, it’s worth it to me. I feel like I look a lot more professional at work with sleek hair, and my getting ready time in the morning is minimal. Before it would take me 40 min to dry my hair nicely. Now I put it up in a towel while I get dressed and do makeup, then literally use my fingers to “brush thru it” with the blow dryer, and it’s perfectly straight, shiny and dry in about 2 min. The keratin also protects my hair from the heat, so I can go longer without cutting it, and it gets nice and long! Perfect in summer for me bc the heat just makes my hair crazy.
I’m overdue to get another, and my curls are totally coming back. I can also easily curl it with an iron for fancy events without an issue. If your friend can do it for you, I say give it a try. Maybe wait til after your wedding though 😀