being careful not to develop bad habits

I've been working on solving tactical exercises lately. Since we're starting to get to more difficult problems, I really need to be careful not to develop bad habits. Namely, you have to sit there and spin out all the variations before making the first move. Sometimes you can stop on some of the variations if you know that you'll have an overwhelming attack and you can work out the details over the board, but you can't rely on the fact that there is an answer to guide your choice. However, I really do with there were a good "give up and show me the answer" option in CT Art, because sometimes that would help me avoid developing some bad habits. The scoring is also annoying sometimes. If, on level 50, you just can't see it, but they give you a hint immediately after you fail and you can figure it all out from there, hey, you get 37/50 points. If you see the idea, get all the variations right, but at the very end you miss the maneuver that the problem wants you to take that has a slight plus over whatever it is you've tried a few times, you get, like, 22/50. In the first one, however, you completely missed the idea and probably lost the game with your move, so you should get 0, but you've still won the second game.