I would disagree there. Citrus are easy to root in my opinion. I would use a rooting hormone but I know plenty who don't even bother with that - just stick it in soil, put a clear bag over it and wait 6-8 weeks. I'm not sure on the best method, but I know removing a lot of the leaves is the best idea, and I have read some who remove all of the leaves if the cutting is from newer growth.