Cry it out method?

Katie
Hey guys my girl is 2 months and 2 weeks and she always wants to be held and cries when i put her down. I never wanted to do cry it out but my back hurts from holding her all the time and i cant get anything done. I i have a sling but i dont like using it much and im starting to think about CIO i want her to be okay with not being held. This isnt for naps or bed time she doesnt cry when i put her down at bedtime she sleeps form 10 to 7 every night and is great. Its just during the day. Noone judge me for thinking about this. But i had some questions if i do it. How long do i let her cry before giving in? Where do i put her just in her swing or laying in her crib or what?