anybody do or planning to do cry it out?

Olivia • SAHM 🤰🏽 10/17/2016 👦🏼 🤰🏽 8/31/2018 👶🏼 Carter and Leo ❤️
Thinking about doing cry it out after we get home from vacation next month, he'll be 6 months old. I think he went through a sleep regression recently and it never ended and he's developed bad habits. He used to sleep 10 hours straight no problem! 😭 
Any tips on CIO? How long did it take you? 
No judgement please, I'm really sad about this but going crazy. 
UPDATE:  thanks for all your help!! Also do you guys use a night light or any projections? I will definitely use white noise but I don't know about a light yet?