Can you guys teach me how to nap train? I did nighttime/nap training with LO1 all in 1 shot, and it wasn't toooooo bad. We basically let her CIO until she learned how to fall asleep on her own.

LO2 goes down at night with very little to no crying. But naps are HORRENDOUS. She will not fall asleep unless we rock, stroll, wear and will wake up as soon as we put her down, stop strolling/moving. I've been trying to do CIO for naps, but the kid is freaking stubborn and will cry the whole entire time. Do I just keep at it, or is it useless? She's 5.5 months.