It is (mostly) possible to stop saying no to young children. If we recognize that little ones are doing what they are programmed to do – which is to learn EVERYTHING they possibly can by interacting with the world around them – then we can understand that telling them no thwarts their most essential drive, and is frustrating, confusing, and invalidating of what they are: little natural scientists and explorers.
It's entirely reasonable to put things off limits that will be unsafe, wasteful or messy. Close the bathroom door to keep her out of the TP, block her access to the printer, etc. But it's our job as parents to do that creatively so that we don't squelch or frustrate our children's natural curiosity and joy in exploration.
Here's the most successful strategy for most families: Save No! or Stop! for potentially dangerous situations. Consider the great temptations around your home – you know what they are by now – and give your daughter attractive alternatives (redirect her interest). Remove as many as possibe, or get them up above her reach. If she's determined to get to the printer, place a large box on its side between her and the temptation. Put one or two items in it that make the printer interesting to her (grownup stuff, you know) like a couple of sheets of paper, a dead cell phone or unplugged calculator, things with buttons to push.
A brightly-colored kid's toy will just not have the same appeal, because it's for kids. She wants to handle the things that YOU get to use, and that's an important developmental curiosity that we do well to take advantage of. So when you can, probably when she's a little more verbal, hold her on your lap and show her the proper ways to use the big-people stuff. Young children in more primitive societies are taught how to use sharp tools at an early age, through close parental interaction.
Also, when you do need to prevent your child from doing what she really, really wants, it's usually very helpful to really, really empathize with her as you redirect her attention elsewhere. "Yes, sweetie, that looks SO interesting, and I can see that you really want to touch it. I wish I could let you, but it's not ours. Here, look at this thing that I CAN let you touch. See? This is how it works…."
"Discipline" in its purest form means teaching. Save the idea of or "punishment" for some future date that may never need to come.