There isn't any real way to discipline a 17 month old, but you can start establishing boundaries. I have a 16 month old, and with the new language skills have come some attitude and temper! Firstly, I taught her the word please. It took about a month, but she uses it regularly when she asks for something, which has helped to end the constant whining and pointing. When she whines and points I can ask her how she asks nicely and then praise her when she says please. And, if I ask her for something, I always say please.
Redirection is the only real option I've found for when she wants something she can't have or is repeatedly doing something she shouldn't do. I'll just take her to another area or distract her with something new. Sometimes it doesn't work, but often, it does.
If she's doing something REALLY uncalled for, dangerous, or throwing a mini temper tantrum, I attempt to make eye contact with her as best I can down on her level, and tell her no in a calm firm voice with a short explanation of why. If she's hitting or pulling hair, (usually from excitement) and she's on my lap or in my arms, I'll put her down on the floor, and then ignore the tantrum. Once she's calmer or a minute later, whichever comes first, I'll give her a hug, explain what she did wrong again, and ask her for a kiss and tell her I love her. In public situations, I remove her immediately from the restaurant, room, or environment, and instead of putting her down I'll hold her making sure she's facing away from me and I'll be unresponsive, either for one minute or until she calms down.
It seems to be working so far. Generally speaking, she's a wonderfully behaved little girl who is happy and loving. I never raise my voice to her (yet!) but I also try to avoid getting lazy. Consistency is the only thing that works at this age. So, when you set a boundary, I think you have to be prepared to constantly redirect until that boundary is learned. It's exhausting, but you're laying the groundwork for a 2-5 year old who understands boundaries and rules. And, who understands that you mean business every day of the week. I believe that these first power struggles are vital to win. She can be stubborn, but I'll outlast her every time. I'm only this rigid about boundaries now because I don't want to have to scream at my child later. That's what I always remind myself when I'm making her sit on the couch instead of stand for the 500th time. This is the only way I can think of to gently establish my authority without breaking her spirit.