It won't be hard to break the habit later. It's a newborn! Please don't worry about it yet! First couple months are do what you need to so they sleep! I feed my kids to sleep. Then sleep train them at 4 months. My kids all sleep great!
I am struggling myself as well. My baby wakes up so quickly once I put him down in his bassinet.
We contact nap during the day for the most part and then he sleeps in his bassinet at night. We do a heating pad on the changing table and in the bassinet. We also do warm bottles only at night. They’re less warm during the day. And he’ll stay in the lounging pillow for naps during the day for the most part if we’re sitting next to him.
I’m struggling with the same thing right now 😩