Early Sexing?

How's it going everybody? This is my first official grow, so bear with me haha.

I do not have a lot of space, and would greatly benefit from whackin the male half of the crop. The plants are just over a month old, ranging between 8-14in. They have been running on a 18-6 light-cycle. I've read that you can turn the lights to 12-12 for a few days, and then back up to it's normal cycle after the sex is determined? I just wanted to hear what you guys thought about it, and any possible "do's and don'ts" when it comes to doing this.

Thanks a lot!

you are almost there in the 18/6 cycle it will only be a week to 3 weeks to they are pre-sexed. you are just going to stress them out switching the cycle then switching them back, which can cause you to have more males or hermes. patience is the hardest thing but the most important.

Thanks for the quick responses guys! I'll keep them on the 18/6 and try to see if I can tell, if not, pictures will be coming soon haha