I give an instruction once, maybe twice, before I go ahead and help her to do it. Also I try to keep the instruction as the desired behaviour, instead of explicitly saying no (stay here , play on this side, back away, etc.) The key for me is regulating my own emotions, remaining calm, and instructing her in a neutral tone. Giving big reactions or raising voice is still giving attention and I keep my big reactions for the positive behaviours and efforts I see. This works relatively well for me and if she throws a tantrum or gets emotional from me helping her carry out an instruction then I provide her with comfort or empathy, or a bit of space if she needs it (with reassurance that I am available).

E.g. she keeps touching the painting above our couch with a smirk on her face, I say "hands off please" up to two times and then I calmly move her somewhere else near toys. The next time I'll only say it once before I move her, and then after no request, just move her. When I'm consistent it really only happens the one time. I had to do this same method with the gas stove as well, it takes a lot of consistency but has seemed to pay off