Focus on career skill points, the attributes are for fielding only when you create a player... and not very helpful.
The career skill points are a nightmare though, many have tried and failed(including me) to make them max out. The developers have also locked the career mode difficulty which will advance automatically once your skills get high enough, which is really annoying as it makes the game much more difficult.
Good luck, but i don't like your chances of maxing skill points in career mode as it seems to only advances the games locked difficulty to harder difficulties, i think that is the main reason people want a trainer, Max skills and career mode difficulty does NOT advance to higher difficulties.