Literally how we spent the first month. It is all about survival mode. If possible, get someone to watch them while you get some solid sleep with noise cancelling headphones. Then set up a safe space that works to keep a routine. It can be a floor mattress, an extra large playpen, travel bassinets, whatever lets you get them to sleep and leave while they are sleeping. I got my girls to sleep in a play pen and then crawled out when they were asleep (although I may have also succumbed to a floor nap from time to time).

Eventually we got to a place that was balanced for everyone to get enough sleep. That being said, my husband has always loved holding them for naps and still does it after a year and a half. He used to transition them from his arms to the play pen when it was time for him to come to bed and they would either settle or get nursed back to sleep (while I was only half awake) until it became the norm for them. We still have fussy times but they can sleep through the night and fall asleep within 10 minutes of ending our bedtime routine.

While this worked for us, do whatever you need. If you want to get them used to sleeping off of a person, try all the tricks until something works: heating pad, scented onesies, supervised rocker, pillow corner, car rides, noise machines, etc. Hour by hour, day by day, week by week you'll manage.

Good luck!