It's not hard just you have to do it right. The first two I did with the last batch I did at the top and used clear nail polish to attempt to cover the hole. Killed hem both. Then in that same batch I did 3 more and I did it at the bottom but I didn't know about the "pocket" at that time though. I also used the nail polish. One of then did develop but didn't hatch. I think the combo of not quite putting the needle in the right spot and the nail polish is what killed those. I would do it again but I don't have a huge reason to do it just was for the heck of it.