I've been following the Money Moustache type approach for a while now myself. I highly recommend it, but the closer I get to the goal the more I realise I need something else constructive to do if/when I jack it all in.
I've known a few people who've successfully retired using this approach. For me I don't see the point, who wants to spend their lives just saving every penny, they seem to get great satisfaction out of it though. Personally I've found a better way is to find work you enjoy and people will pay you for, find somewhere you like to live and enjoy the rest of your life without counting pennies on bars of soap.
I'm doing all of the above: living in a place so like, working at a job that is interesting and pays well. My new job has tripled my salary, and so rather than inflating my lifestyle, I've just been saving & investing the new money. I'm happy spending the same old amount based on my old salary, and just taking a couple more vacations a year.