i don't think it detracts from the fun learning known techniques. it's certainly still a challenge to apply them sometimes. however if your logic is sound and you enjoy solving puzzles with your own techniques then do that!
With some difficult puzzles you might struggle a lot when a known technique would help you find the solution quicker. one approach would be to use your own techniques until you come up against a wall or find a puzzle that was no fun to solve with your own techniques and then see what some of the programs/forum users suggest you use to solve that puzzle.
it's a puzzle and it's supposed to be fun. if you enjoy using your own techniques then do so. if at some time you decide to learn some well known techniques do that