Do you HAVE to be done at 14 months? I'm not one for letting the children self wean but I wasn't the type who HAD to be done at 1 year either. In fact, my oldest was the youngest to wean at 13 months. My next son was 22 months and my youngest was just over 2. Yeah, he went WAY longer than I wanted him to but he was the hardest to wean.
He needs to be down to the nighttime feedings I think to make weaning easier. People would tell me to stop nursing by a minute less each time. I don't know about you but we didn't have exact timed feedings like that so that didn't help me one bit.
So during the day I would distract. I'd go for a walk when it was naptime so he'd fall asleep in the stroller or I'd put a movie or Sesame Street on then sit with him so he was still getting the cuddle time. He'd fall asleep while watching his show. Once he got down to just nighttime, I had my husband take over. At night, he would take them upstairs with a cup or bottle and lay with them for a while. The first couple of nights there would be tears but my husband would just keep cuddling them, telling them it was okay, and just talking softly to get them to calm down. Usually by the third night they would just lay there, even with me, and go to sleep without looking for it. I would start with the naps though.
I would absolutely be against just letting him CIO though. Personally I find that method mean regardless of the reason but to take something that he has come to see as his comfort time and just rip all aspects away from him sounds harsh to me. I would do everything I could to make the time still special which is why I suggested going for a walk or cuddling while watching one of his favorite shows. It may take a while. You might not be able to just start cutting him off right away. I don't think you are wrong for letting him nurse when he really wants to. The thing is to try to delay giving it to him and to shorten the time he has it. You can do that without sending him into a tizzy and in the end, yourself too.
I wish you the best. I give you a ton of kudos for nursing to 1 year as that is so important in itself. I do feel for you because I know what it's like to have one (or 2 in my case) who won't give it up without a struggle. If you can be okay with maybe going past 14 months as long as you are on the right path and can do this calmly for both of you, I think you'll be fine before you know it. Just don't forget the cuddles so he knows even though the booby went away, you and the cuddles did not! :)
BTW, I don't know why people think it has to be all or nothing. We have children. If there's one thing I learned quickly is that all or nothing doesn't always work. Sometimes you have to give a little which means you can't "be tough and stick to your guns no matter what" and sometimes you have to push your little one to do things they don't want to vs. letting them go until they want to. We have to compromise in relationships all the time. Doing so with our children isn't a bad thing and is teaching them the art of compromise too. They just don't realize it yet.