Just about all of the articles in the tech section have a difficulty rating that is accurate from my experience. If you were to come up with that list I was talking about it would be fairly accurate right from the start and you could post it for further tweaking.
1989 240SX Fastback. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1995 300ZX Twin Turbo Warning: Objects in mirror aren't as fast as they thought they were.