2.5 year old and 6 week old

Okay, I'm in a bit of a pickle.

How do you get your 6 week old down for their nap? She's becoming more aware which seems to make it harder for her to "just" fall asleep (nursing, rocking ect) but won't go to sleep on her own either. I can't be spending forever getting her to sleep. Another thing is I go in to reassure her if she gets upset but my 2.5 year old follows, I've been working in getting her to wait but that only lasts 2 minutes before she's curious. I don't want to have to wear the carrier ALL the time. Any tips? My first was a crappy napper which sucked but it was just her. I need a plan. 🤷