Self soothing baby? Too little?

Jocelyn

My baby is currently 3 1/2 months. Up until now we hold him to put him to sleep. Well I’m ready for him to learn to put himself to sleep. I’ve attempted a few times and he cries hysterically. Normally this would be ok for me except I have a 17 month old as well and don’t want him to wake her... any suggestions?

Also, is he still to small? Should I wait a few more months? My daughter learned to self sooth at around 7/8 months.