There's a book called "How to survive without a salary" by Charles Long. It may be out of print, but I would recommend you read that. There's also a series of

There's a book called "How to survive without a salary" by Charles Long. It may be out of print, but I would recommend you read that. There's also a series of books called "The Tightwad Gazette" with a similar theme of learning to spend less. Successfully retiring from a tech job is highly likely to be equal parts investing well and learning to live on less. One or the other won't solve it. Best of luck.